Solid cosmetic composition comprising geosmin and a carbon dioxide effervescent component

Abstract

The present invention provides a solid cosmetic product comprising geosmin, and also provides a solid cosmetic product comprising (a) sodium bicarbonate in an amount of from 25 to 70 wt% based on the solid cosmetic product; (b) citric acid in an amount of from 5 to 35 wt% based on the solid cosmetic product; (c) sodium chloride in an amount of from 5 to 45 wt% based on the solid cosmetic product; and (d) magnesium sulphate in an amount of from 5 to 45 wt% based on the solid cosmetic product.

Description

[0001] SOLID COSMETIC COMPOSITION COMPRISING GEOSMIN AND A CARBON DIOXIDE EFFERVESCENT COMPONENT

[0002] FIELD OF THE INVENTION

[0003] The present invention relates to a solid cosmetic product and use of the same to improve wellbeing.

[0004] BACKGROUND TO THE INVENTION

[0005] The present invention relates to products particularly those for use in contact with the human body.

[0006] In the modern era, a high proportion of cosmetic products are typically provided to consumers in the form of liquid or pastes. For example, hair styling products are typically provided as hair gels or pastes, which require packaging in order to transport and store said products. Oral care (or oral hygiene) products, such as toothpastes and mouthwashes, are also either provided in paste or liquid form, thus requiring some form of external packaging. They are sold in containers to the end user and may be dispensed by the end user. However, the required use of packaging is a disadvantage. From an environmental perspective, waste packaging is a significant problem, despite the availability of recycling.

[0007] One popular cosmetic product which is both solid and provides a more ‘exciting’ product than its predecessor is the Bath Bomb. Bath bomb type products may be considered a form of bath salt as they typically comprises at least one salt of carbonic acid, and at least one acidifying agent. When a bath bomb is placed into water, it vigorously effervesces releasing carbon dioxide. The reaction is an acid-base reaction resulting in the production of a salt, carbon dioxide and water. Other more recent solid products, particularly those developed by the present applicant include solid shower gels, solid shampoos, solid hair conditioners, solid hair dye, solid body lotions, solid massage bars, shower jellies, solid moisturisers, solid body scrubs, solid bubble bars for creating bubble baths, solid sunscreens, and solid make-up. Many of these products address the issue of avoiding unnecessary packaging, and many of them also provide their own unique user experiences, in additional to the functional delivery of a cosmetically active agent.

[0008] In all fields, including the field of cosmetics, there is an increasing awareness of the importance of mental well-being, in addition to physical well-being. In recent years there has been an increase both in the recognition of the importance of good mental health but also increased reports of poor mental health. There are many potential causes for this reported increase in poor mental health. Furthermore, many solutions or coping mechanisms have been offered for dealing with these issues. One possible solution or alleviation commonly discussed is physical exercise. Physical exercise, and in particular outdoor physical exercise is well established to improve mental health. This has led to a desire to encourage more participation, and to encourage participation in outdoor exercise in particular.

[0009] It is of course understood that physical exercise impacts not only on mental health but on physical health. The impact on physical health, while undeniably positive, may have some drawbacks. In particular, physical exertion may lead to muscle tiredness or soreness, or cramps or joint stiffness immediately after the physical exercise. These negative aspects, although outweighed by overall increases in physical and mental well-being, may deter some from repeating physical exercise. This is particularly case for those who are new to physical exertion. Furthermore, even for individuals who exercise more frequently, including athletic individuals, negative aspects such as muscle tiredness or soreness or cramps or joint stiffness, may impact on their continued exercise and training.

[0010] The present invention seeks to provide a solid cosmetic product which provides benefits to physical and / or mental health in addition to cosmetic benefits.

[0011] SUMMARY OF THE INVENTION

[0012] In a first aspect, there is provided a solid cosmetic product comprising geosmin.

[0013] In a second aspect, there is provided a solid cosmetic product comprising

[0014] (a) sodium bicarbonate in an amount of from 25 to 70 wt% based on the solid cosmetic product;

[0015] (b) citric acid in an amount of from 5 to 35 wt% based on the solid cosmetic product;

[0016] (c) sodium chloride in an amount of from 5 to 45 wt% based on the solid cosmetic product; and

[0017] (d) magnesium sulphate in an amount of from 5 to 45 wt% based on the solid cosmetic product. In a third aspect, there is provided a solid cosmetic product as defined herein for use to provide bathing water after exercise for one or more of reducing muscle tiredness, reducing muscle soreness, reducing instances of cramp, reducing joint stiffness, improving mental alertness, improving mood, improving mental wellbeing, improving quality of sleep.

[0018] In a fourth aspect, there is provided a solid cosmetic product as defined herein for use after exercise for one or more of reducing muscle tiredness, reducing muscle soreness, reducing instances of cramp, reducing joint stiffness, improving mental alertness, improving mood, improving mental wellbeing, improving quality of sleep.

[0019] In a fifth aspect, there is provided a cosmetic method comprising contacting the skin of a user with a solid cosmetic product as described herein.

[0020] In a sixth aspect, there is provided a method of bathing, the method comprising immersing a bather in bathing water into which a solid cosmetic product as defined herein has been dispersed or into which a solid cosmetic product as defined herein is dispersed during bathing.

[0021] In a seventh aspect, there is provided a method of bathing, the method comprising immersing a bather in bathing water having a temperature of no greater than 15°C into which a solid cosmetic product as defined herein has been dispersed or into which a solid cosmetic product as defined herein is dispersed during bathing.

[0022] For ease of reference, these and further aspects of the present invention are now discussed under appropriate section headings. However, the teachings under each section are not necessarily limited to each particular section.

[0023] Advantages

[0024] It has been found that by providing the solid cosmetic product of the present invention in which there is included geosmin, a user of a solid cosmetic product may be provided with a highly desirable product. Geosmin [(4S,4aS,8aR)-4,8a-Dimethyloctahydronaphthalen- 4a(2H)-ol] is the compound responsible for the earthy, musty smell of drinking water. It is also known to be released in the environment after or shortly before rainfall. Evidence suggests that it has benefits for human mood. Humans are particularly sensitive to its odour, and the human nose is said to detect geosmin at less than five parts per trillion. It is believed that this high sensitivity may have allowed humans to find water in arid environments.

[0025] One study (Kim, M et al, 2017.) found that inhaling geosmin produced significant changes in absolute alpha and absolute beta waves in a particular region of the brain. These changes during the inhalation of geosmin were linked with the calmness and relaxation.

[0026] Contact with soil containing geosmin-producing species also showed positive effects although these were not directly attributed to inhalation alone. In a recent study (Kim, SO et al 2022.), adults performed soil-mixing with soil inoculated with geosmin-producing Mycobacterium vaccae and Streptomyces rimosus for five minutes. As a result, alpha wave activity increased in the occipital lobe of the brain, showing a psychophysiological stabilising effect, and serotonin was found to increase significantly in blood metabolite analysis. Heart rate decreased.

[0027] A further study (Choi NY et al, 2022) looked at the effects of seed-sowing in Streptomyces rimosus-ric soil: a bacterial species also known to release large amounts of geosmin. Participants participated in seed-sowing activities twice for 20 minutes each and results found a significant increase in indicators related to brain arousal and concentration.

[0028] It has been found that through provision of a solid cosmetic product of the present invention in which there is included geosmin, a user is offered a cosmetic that not only delivers a cosmetic effect but which also provides the mental health benefits of inhaling geosmin.

[0029] It has also been found that in addition to, or in the alternative to, including geosmin, that advantages in respect of recovery after exercise may be delivered by bathing in water in which has been dispersed a solid cosmetic product containing significant amounts of sodium chloride (salt) and magnesium sulphate (Epsom salt). It has been found that after exercise bathing in this manner may reduce muscle tiredness and / or reduce muscle soreness and / or reduce instances of cramp and / or reduce joint stiffness and / or improve mental alertness and / or improve mood and / or improve mental wellbeing and / or improve quality of sleep.

[0030] In respect of products containing geosmin and products containing significant amounts (5 to 40 wt%) of sodium chloride (salt) and magnesium sulphate (Epsom salt), it has been further found that highly beneficial effects may be observed when the user bathes with the product in ‘cold’ bathing water, such as bathing water having a temperature of no greater than 15°C. In particular, it is found that during exposure to ‘cold’ water central core temperature is prioritised, which in turn results in skin temperature drop. Peripheral blood flow decreases as water temperature becomes colder and heat is lost from the body surface faster than it is replaced. Shivering occurs and cardiac output and metabolism increases (Marriott BM et al).

[0031] A study (Sramek P, 2000) compared the effects of hot (32°C), warm (20°C) and cold (14°C) water on the hormone and cardiovascular functions of a group of young men. The findings were that hot water immersion lowered heart rate (by 15%) and systolic and diastolic blood pressures (by 11 %, or 12%, respectively), compared to controls at ambient air temperature. Hormone production of renin and aldosterone (which help regulate blood pressure) and cortisol (the ‘stress’ hormone) were also lowered. In contrast, cold water immersion (14°C) increased metabolic rate (by 350%), heart rate and systolic and diastolic blood pressure (by 5%, 7%, and 8%, respectively). Plasma, noradrenaline (the ‘fight or flight’ hormone) and dopamine (the ‘reward’ hormone) concentrations were increased by 530% and by 250% respectively. Concentrations of aldosterone (a regulator of blood pressure) increased by 23% but renin activity and cortisol concentrations decreased.

[0032] It has also been found (Huttunen, P et al 2004) that regular winter swimming significantly decreases tension and fatigue and boosts memory, and mood in participants over time. The activity also relieved pain in swimmers who suffered from rheumatism, fibromyalgia, or asthma and improved general well-being. Research (Esperland D, et al) shows that regular winter swimmers acclimatise to the cold, though this ceases if swimming stops. Similar findings (Park YS, et al 1983) have been demonstrated in a group of Korean female divers called Ama, who are exposed to cold water from a young age. In older, cold-adapted Ama the response to cold is heat loss reduction rather than increased metabolic increase. This acclimatisation gradually changed when they began to wear wetsuits.

[0033] DETAILED DESCRIPTION

[0034] Composition

[0035] As discussed herein, in one aspect of the present invention, there is provided a solid cosmetic product comprising geosmin. As discussed herein, in one aspect of the present invention, there is provided a solid cosmetic product comprising

[0036] (a) sodium bicarbonate in an amount of from 25 to 70 wt% based on the solid cosmetic product;

[0037] (b) citric acid in an amount of from 5 to 35 wt% based on the solid cosmetic product;

[0038] (c) sodium chloride in an amount of from 5 to 45 wt% based on the solid cosmetic product; and

[0039] (d) magnesium sulphate in an amount of from 5 to 45 wt% based on the solid cosmetic product.

[0040] It will be understood by one skilled in the art that the nature of a cosmetic product means that the product is not edible. Thus in a further aspect the present invention provides a nonedible solid cosmetic product comprising geosmin. In a further aspect the present invention provides a non-edible solid cosmetic product comprising

[0041] (a) sodium bicarbonate in an amount of from 25 to 70 wt% based on the solid cosmetic product;

[0042] (b) citric acid in an amount of from 5 to 35 wt% based on the solid cosmetic product;

[0043] (c) sodium chloride in an amount of from 5 to 45 wt% based on the solid cosmetic product; and

[0044] (d) magnesium sulphate in an amount of from 5 to 45 wt% based on the solid cosmetic product.

[0045] The solid products of the present invention are compositions which can substantially sustain their physical shape when unsupported by external means, e.g. packaging etc. Thus, they are considered to be solid, solid-like, in solid form or in solid-like form at room temperature. For the avoidance of doubt the solid product must remain substantially solid at up to 30°C.

[0046] By solid-like, it is understood that some materials are considered on a day to day basis to be solid, yet over an extremely long period of time, may alter in shape, e.g. amorphous materials such as glass etc. However, they are considered to be solid-like as, for the purpose they fulfil, they are solid.

[0047] Due to the solid form of the compositions of the present invention, external packaging is not required to maintain the shape of the composition. The composition of the present invention is typically made by moulding of the product.

[0048] The solid cosmetic product may be any suitable cosmetic which may be formed into a solid. Examples include bath bombs, bath oils, bath melts, solid bubble bars, soaps, syndet bars, solid shower gels, massage bars, shower jellies, solid moisturisers, solid body scrubs.

[0049] The essential components of the solid cosmetic product are defined herein. However the composition may contain further additional components.

[0050] In a preferred aspect the solid cosmetic product further comprises a colouring. Preferably, the colouring is a water soluble colouring. The colouring can be naturally derived or it can be synthetic.

[0051] Preferably the solid cosmetic product comprises colouring in an amount of from 0.001 to 5 wt.% based on the solid cosmetic product, such as in an amount of from 0.001 to 4 wt.% based on the solid cosmetic product, such as in an amount of from 0.001 to 3 wt.% based on the solid cosmetic product, such as in an amount of from 0.001 to 2 wt.% based on the solid cosmetic product, such as in an amount of from 0.1 to 2 wt.% based on the solid cosmetic product, such as in an amount of from 1 to 2 wt.% based on the solid cosmetic product.

[0052] In one aspect the solid cosmetic product further comprises a fragrance in addition to geosmin. The fragrance may be selected from essential oils. The fragrance, such as the essential oil, may be present in the solid cosmetic product in an amount of from 0.001 to 10 wt.% based on the solid cosmetic product, such as in an amount of from 0.001 to 8 wt.% based on the solid cosmetic product, such as in an amount of from 0.001 to 5 wt.% based on the solid cosmetic product, such as in an amount of from 1 to 5 wt.% based on the solid cosmetic product, such as in an amount of from 2 to 4 wt.% based on the solid cosmetic product.

[0053] Geosmin

[0054] Geosmin is the compound (4S,4aS,8aR)-4,8a-Dimethyloctahydronaphthalen-4a(2H)-ol and has the structure

[0055] Geosmin may be present in any suitable amounts to achieve the desired response from the user. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.00005 to 0.005 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.0001 to 0.005 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.0002 to 0.005 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.0003 to 0.005 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.0004 to 0.005 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.0001 to 0.004 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.0001 to 0.003 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.00001 to 0.002 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.00001 to 0.001 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.00001 to 0.0008 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.00001 to 0.0006 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.00001 to 0.0005 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.00005 to 0.005 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.00008 to 0.002 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.0001 to 0.001 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.0002 to 0.0008 wt% based on the solid cosmetic product. In one aspect, the solid cosmetic product comprises geosmin in an amount of from 0.0002 to 0.0006 wt% based on the solid cosmetic product.

[0056] In a further aspect the present invention provides a solid cosmetic product comprising (a) sodium bicarbonate in an amount of from 30 to 80 wt% based on the solid cosmetic product;

[0057] (b) citric acid in an amount of from 5 to 40 wt% based on the solid cosmetic product;

[0058] (c) sodium chloride in an amount of from 5 to 40 wt% based on the solid cosmetic product;

[0059] (d) magnesium sulphate in an amount of from 5 to 40 wt% based on the solid cosmetic product; and

[0060] (e) geosmin in an amount of from 0.00005 to 0.005 wt% based on the solid cosmetic product.

[0061] Carbon dioxide effervescent component

[0062] In one aspect the solid cosmetic product comprises a carbon dioxide effervescent component which effervesces on contact with water. In one aspect the solid cosmetic product consists of the carbon dioxide effervescent component.

[0063] In one aspect the carbon dioxide effervescent component comprises a salt of carbonic acid; and an acidifying agent. In one aspect the solid cosmetic product consists of the carbon dioxide effervescent component. Thus, in one aspect the solid cosmetic product is a carbon dioxide effervescent component comprising (a) a salt of carbonic acid; and (b) an acidifying agent.

[0064] Thus in a further aspect, the present invention provides a solid cosmetic product comprising geosmin and a carbon dioxide effervescent component, wherein the carbon dioxide effervescent component comprises a salt of carbonic acid; and an acidifying agent.

[0065] Thus in a further aspect, the present invention provides a solid cosmetic product comprising geosmin and a carbon dioxide effervescent component, wherein the carbon dioxide effervescent component comprises a salt of carbonic acid; and an acidifying agent. In a further aspect, the solid cosmetic product comprises (a) sodium bicarbonate in an amount of from 25 to 70 wt% based on the solid cosmetic product; (b) citric acid in an amount of from 5 to 35 wt% based on the solid cosmetic product; (c) sodium chloride in an amount of from 5 to 45 wt% based on the solid cosmetic product; and (d) magnesium sulphate in an amount of from 5 to 45 wt% based on the solid cosmetic product. In a further aspect, the solid cosmetic product comprises (a) sodium bicarbonate in an amount of from 25 to 70 wt% based on the solid cosmetic product; (b) citric acid in an amount of from 5 to 35 wt% based on the solid cosmetic product; (c) sodium chloride in an amount of from 5 to 45 wt% based on the solid cosmetic product; (d) magnesium sulphate in an amount of from 5 to 45 wt% based on the solid cosmetic product; and (e) geosmin. It will be appreciated that (a) and (b) provide a carbon dioxide effervescent component.

[0066] It has been found that in these aspects once the solid cosmetic product of the present invention is added to water (such as bathing water) the carbon dioxide effervescent component will effervesce, as seen with the majority of commercially available bath bombs. As the product effervesces geosmin is released from the solid composition and dispersed in the air where it is then inhaled by the user. This rapidly delivers the geosmin to the user and the advantages discussed herein are then realised. In a similar manner, as the product effervesces the solid components of the product are delivered into the bathing water. In particular, the sodium chloride and magnesium sulphate are delivered into the bathing water. The advantages of the present invention as described herein are then realised.

[0067] In addition to the improvements in mental and physical well-being offered by the present composition, the invention may produces visual stimulation to the user that provides relaxation and therapeutic effects. This is in addition to any bathing effects.

[0068] The salt of carbonic acid and the acidifying agent are present in the carbon dioxide effervescent component in any suitable amounts to achieve effervescence. One skilled in the art is able to combine these materials to provide the desired rate of effervescence.

[0069] Preferably the salt of carbonic acid and the acidifying agent are present in a weight ratio of from 95:5 to 50:50, preferably in a weight ratio of from 90:10 to 50:50, preferably in a weight ratio of from 90:10 to 55:45, preferably in a weight ratio of from 90:10 to 60:40, preferably in a weight ratio of from 90:10 to 70:30.

[0070] In one aspect the carbon dioxide effervescent component comprises a salt of carbonic acid selected from alkali metal carbonates, alkali metal bicarbonates and mixtures thereof.

[0071] Preferably, the salt of carbonic acid is selected from sodium bicarbonate, sodium carbonate and mixtures thereof. In one aspect the carbon dioxide effervescent component comprises an acidifying agent selected from monocarboxylic acids, dicarboxylic acids, tricarboxylic acids and mixtures thereof.

[0072] Preferably the acidifying agent is selected form citric acid, potassium bitartrate (cream of tartar) and mixtures thereof.

[0073] In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 40 to 95 wt.% based on the carbon dioxide effervescent component. It is understood that the carbon dioxide effervescent component is the combined amount of materials that react to form carbon dioxide, and typically comprises a salt of carbonic acid; and an acidifying agent.

[0074] In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 45 to 95 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 50 to 95 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 50 to 90 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 55 to 90 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 60 to 85 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 60 to 80 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 60 to 75 wt.% based on the carbon dioxide effervescent component.

[0075] In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 60 wt.% based on the carbon dioxide effervescent component. It is understood that the carbon dioxide effervescent component is the combined amount of materials that react to form carbon dioxide, and typically comprises a salt of carbonic acid; and an acidifying agent. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 55 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 50 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 45 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 40 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 35 wt.% based on the carbon dioxide effervescent component. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 30 wt.% based on the carbon dioxide effervescent component.

[0076] In a preferred aspect the carbon dioxide effervescent component comprises sodium bicarbonate in an amount of from 55 to 90 wt.% and citric acid in an amount of from 5 to 40 wt.% based on the carbon dioxide effervescent component.

[0077] The amounts of the salt of carbonic acid and the acidifying agent based on the solid cosmetic product will, in part, depend on the amounts of other materials present in the solid cosmetic product. For example, the amounts may vary depending on the amounts of sodium chloride and / or magnesium sulphate present in the solid cosmetic product

[0078] In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 30 to 70 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 35 to 70 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 40 to 70 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 45 to 70 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 50 to 70 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 50 to 65 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 55 to 70 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 30 to 65 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 30 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 35 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 40 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the salt of carbonic acid, and preferably sodium bicarbonate, in an amount of from 45 to 60 wt.% based on the solid cosmetic product.

[0079] In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 35 wt.% based on the solid cosmetic product. It is understood that the carbon dioxide effervescent component is the combined amount of materials that react to form carbon dioxide, and typically comprises a salt of carbonic acid; and an acidifying agent. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 30 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 25 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 20 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 15 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from 5 to 10 wt.% based on the solid cosmetic product. In a preferred aspect the carbon dioxide effervescent component comprises the acidifying agent, and preferably citric acid, in an amount of from

[0080] 10 to 35 wt.% based on the solid cosmetic product.

[0081] In a preferred aspect the carbon dioxide effervescent component comprises (a) a salt of carbonic acid; (b) an acidifying agent comprising citric acid and cream of tartar, wherein the weight ratio of citric acid to cream of tartar is from about 4:1 to about 1 :7. In a preferred aspect the solid cosmetic product is as described in WO2019 / 243802.

[0082] Sodium Chloride

[0083] In one aspect the solid cosmetic product comprises sodium chloride. Sodium chloride may be present in any suitable amounts.

[0084] In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 5 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 5 to 55 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 5 to 50 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 5 to 45 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 5 to 40 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 5 to 35 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 5 to 30 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 5 to 25 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 5 to 20 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 10 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 15 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 15 to 50 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 15 to 40 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride in an amount of from 15 to 30 wt.% based on the solid cosmetic product.

[0085] Magnesium Sulphate

[0086] In one aspect the solid cosmetic product comprises magnesium sulphate. Magnesium sulphate may be present in any suitable amounts.

[0087] In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 5 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 5 to 55 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 5 to 50 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 5 to 45 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 5 to 40 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 5 to 35 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 5 to 30 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 5 to 25 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 5 to 20 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 10 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 15 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 15 to 50 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 15 to 40 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises magnesium sulphate in an amount of from 15 to 30 wt.% based on the solid cosmetic product. Sodium Chloride and Magnesium Sulphate

[0088] In one aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate. Sodium chloride and magnesium sulphate may be present in any suitable amounts.

[0089] In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 5 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 5 to 55 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 5 to 50 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 5 to 45 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 5 to 40 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 5 to 35 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 5 to 30 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 5 to 25 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 5 to 20 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 10 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 15 to 60 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 15 to 50 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 15 to 40 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises sodium chloride and magnesium sulphate each in an amount of from 15 to 30 wt.% based on the solid cosmetic product. Additional Components

[0090] In one aspect the solid cosmetic product comprises water. Water may be present in any suitable amount. In a preferred aspect the solid cosmetic product comprises water in an amount of from 0.01 to 3 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises water in an amount of from 0.01 to 2 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises water in an amount of from 0.01 to 1 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises water in an amount of from 0.01 to 0.5 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises water in an amount of from 0.01 to 0.2 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises water in an amount of from 0.01 to 0.1 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises water in an amount of from 0.02 to 3 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises water in an amount of from 0.05 to 3 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises water in an amount of from 0.1 to 3 wt.% based on the solid cosmetic product.

[0091] In one aspect the solid cosmetic product comprises a glycol. A understood by one skilled in the art a glycol is an aliphatic diol. The glycol may be present in any suitable amount. The glycol may be any suitable glycol. In a preferred aspect the solid cosmetic product comprises glycol in an amount of from 0.01 to 3 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises glycol in an amount of from 0.01 to 2 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises glycol in an amount of from 0.01 to 1 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises glycol in an amount of from 0.01 to 0.5 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises glycol in an amount of from 0.01 to 0.2 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises glycol in an amount of from 0.01 to 0.1 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises glycol in an amount of from 0.02 to 3 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises glycol in an amount of from 0.05 to 3 wt.% based on the solid cosmetic product. In a preferred aspect the solid cosmetic product comprises glycol in an amount of from 0.1 to 3 wt.% based on the solid cosmetic product. The solid product of the present invention may contain further components as described in WO2021 / 105666, WO2019 / 016496, WO2016 / 170335, WO2015 / 136246 or

[0092] WO20 11 / 154727.

[0093] In a preferred aspect the carbon dioxide effervescent component comprises (a) a salt of carbonic acid; (b) an acidifying agent comprising citric acid and cream of tartar, wherein the weight ratio of citric acid to cream of tartar is from about 4:1 to about 1 :7. In a preferred aspect the solid cosmetic product is as described in WO2019 / 243802.

[0094] The solid product of the present invention may also comprise one or more cosmetically acceptable additives. The person skilled in the art is aware of a range of cosmetically acceptable additives which are suitable for incorporation into such compositions. For example, binders, fillers, opacifiers, perfumes, fragrances, decorative items and mixtures thereof.

[0095] It is particularly preferred that the composition of the present invention further comprises a fragrance. Preferably the fragrance is selected from essential oils.

[0096] Fruit and herb extracts and juices, vegetable oils and essential oils are all compatible with the composition. Colours, both naturally derived and synthetic can be used to colour the product.

[0097] In one embodiment, the cosmetically acceptable additives are selected from the group consisting of essential oils, vitamins, fragrances, colourings, clays, decorative articles and mixtures thereof.

[0098] The essential oils may be selected based on the fragrance desired, skin type to be treated and other effects desired based on the well-known properties of essential oils. The addition of essential oils, when taken in to the nose, are known to alter mood. For example, essential oils are known to create effects of drowsiness or stimulating the senses. Many well documented effects can be achieved by the use of essential oils.

[0099] In one embodiment, the one or more essential oils present in the solid product are selected from Tarragon, Lemon myrtle, Jasmin, Ylang ylang, Labdunum, Lemongrass, Rose otto, Grapefruit, Patchouli, Rosemary, Armois, Lemon, Neroli, Sweet violet, Lavender, Orange 50 fold, Vanilla, Peppermint, Benzoin, Hydrangia, Litsea Cubeba, Cardamon, Tonka, and Chamomile blue. In one embodiment, the one or more essential oils present in the solid product are selected from Tarragon, Lemon myrtle, Labdunum, and Lemon.

[0100] Vitamins, particularly B, C and E are very beneficial for the skin. Vitamin rich ingredients such as Wheatgerm oil can also be used to deliver vitamins on to the skin. In a one embodiment, the vitamins are selected from vitamin B, vitamin C, vitamin E and mixtures thereof. It will be appreciated by one skilled in the art that the vitamin may be provided from any suitable source. For example the vitamin(s) may be provided from a synthetic source or from incorporation into the solid product of a material, such as a natural material, that has a high vitamin content.

[0101] The ingredients in the present invention do not require cosmetic preservatives. The use of cosmetic preservatives can increase the potential to irritate the skin.

[0102] The decorative items which may be present in the solid product include items such as glitter, paper such as rice paper, sequins, dried or fresh flowers, herbs, vegetables, parts thereof or mixtures thereof. Other enhancing materials may also be incorporated

[0103] Further preferred additive materials include vegetable oils, chocolate, herbs and spices, cosmetic colours (e.g. paprika, gardenia extract, D&C red no. 30), beans (e.g. aduki), fruit, fresh or dried (e.g. banana, avocado, mango, papaya, kiwi, raspberry, strawberry, blueberries, grapes, tomato, asparagus, or cucumber), honey, glycerin, cosmetic glitter, other vegetable butters (e.g. mango, avocado), clays (e.g. kaolin), starches (e.g. corn starch) and mixtures thereof.

[0104] Amounts

[0105] The above ranges provide preferred amounts of each of the components. Each of these ranges may be taken alone or combined with one or more other component ranges to provide a preferred aspect of the invention.

[0106] Method

[0107] As discussed herein, in one aspect there is provided a method of bathing, the method comprising immersing a bather in bathing water into which a solid cosmetic product as defined herein has been dispersed or into which a solid cosmetic product as defined herein is dispersed during bathing. In other words, the product can be added to bath water before the user immerses themselves in the bathwater or the product can be added to bath water once the user is immersed in the bathwater.

[0108] The bathing water may be any suitable temperature. A typical temperature for a ‘warm’ bath is 32 to 40°C, more typically 36 to 38°C. We have found that use of the present products in a bath at a lower temperature provides particularly advantageous results. As discussed herein, it has been shown that bathing in water that is cooler than is typical for a warm bath provides numerous advantages. In particular, bathing in cool water may improve mental alertness and / or improve mood and / or improve mental wellbeing and / or improve quality of sleep. Furthermore, bathing in cool water after exercise may provide not only these advantages (improve mental alertness and / or improve mood and / or improve mental wellbeing and / or improve quality of sleep) but may also reduce muscle tiredness and / or reduce muscle soreness and / or reduce instances of cramp and / or reduce joint stiffness.

[0109] The present invention therefore further provides a solid cosmetic product as defined herein for use for one or more of improving mental alertness, improving mood, improving mental wellbeing, improving quality of sleep. The present invention also provides a solid cosmetic product as defined herein for use to provide bathing water after exercise for one or more of reducing muscle tiredness, reducing muscle soreness, reducing instances of cramp, reducing joint stiffness, improving mental alertness, improving mood, improving mental wellbeing, improving quality of sleep.

[0110] The temperature of the bathing water in which the user bathes, for example after exercise, and in which the solid cosmetic product has been dispersed, may be no greater than 30°C, such as no greater than 25°C, such as no greater than 22°C, such as no greater than 20°C, such as no greater than 18°C, such as no greater than 15°C. In one aspect the temperature of the bathing water in which the user bathes, for example after exercise, and in which the solid cosmetic product has been dispersed is from 5 to 30°C, such as from 5 to 25°C, such as from 5 to 22°C, such as from 5 to 20°C, such as from 5 to 18°C, such as from 5 to 15°C.

[0111] In one aspect of the present invention, there is provided a method comprising contacting the skin of a user with water in which the solid cosmetic product as defined herein has been placed in, or has dissolved in, or in which the solid cosmetic product as defined herein is dissolving. In a typical method, water is run in to the bath at an acceptable temperature. The user immerses their body in the water and the solid cosmetic composition is dropped into the water. The user then watches the effect of the product on the surface of the water. The user then bathes in the water.

[0112] In a further aspect the present invention provides a solid cosmetic product for use after exercise for one or more of reducing muscle tiredness, reducing muscle soreness, reducing instances of cramp, reducing joint stiffness, improving mental alertness, improving mood, improving mental wellbeing, improving quality of sleep.

[0113] In a further aspect the present invention provides a solid cosmetic product for use to provide bathing water after exercise for one or more of reducing muscle tiredness, reducing muscle soreness, reducing instances of cramp, reducing joint stiffness, improving mental alertness, improving mood, improving mental wellbeing, improving quality of sleep. In this use after exercise, the user bathes in water in which the solid cosmetic product has been dispersed, and the temperature of the water may be no greater than 20°C, such as no greater than 15°C, such as from 5 to 15°C.

[0114] In a further aspect the present invention provides a solid cosmetic product for use to provide bathing water after exercise for one or more of reducing muscle tiredness, reducing muscle soreness, reducing instances of cramp, reducing joint stiffness, improving mental alertness, improving mood, improving mental wellbeing, improving quality of sleep, wherein the user bathes in water in which the solid cosmetic product has been dispersed, and the temperature of the water may be no greater than 20°C, such as no greater than 15°C, such as from 5 to 15°C, and wherein the solid cosmetic product comprises

[0115] (a) sodium bicarbonate in an amount of from 30 to 80 wt% based on the solid cosmetic product;

[0116] (b) citric acid in an amount of from 5 to 40 wt% based on the solid cosmetic product;

[0117] (c) sodium chloride in an amount of from 5 to 40 wt% based on the solid cosmetic product;

[0118] (d) magnesium sulphate in an amount of from 5 to 40 wt% based on the solid cosmetic product; and

[0119] (e) geosmin, such as in an amount of from 0.00005 to 0.005 wt% based on the solid cosmetic product. Example

[0120] The invention will now be described with reference to the following non-limiting example. A solid cosmetic product having the following composition may be prepared.

[0121] A solid cosmetic bathing product having the following composition was prepared. The product was a ‘bath bomb’ type product.

[0122] The fragrance product contained geosmin in a concentration of 0.11wt%.

[0123] 1. Weigh A into mixer and mix briefly

[0124] 2. Mix B together, add to A and mix thoroughly to disperse 600g of this mixture of A and B was combined with the following

[0125] The weight percentages in the final product were

[0126] The prepared product was sent to a panel of testers together with a prior art bath bomb product, namely the Salt Water Soother sold by Lush. The Salt Water Soother did not contain geosmin. The testers were asked to exercise on 3 occasions on different days and bathe as follows. - After the first instance of exercise run a bath and bathe without a product

[0127] - After the second instance of exercise run a bath and bathe with the known Salt Water Soother product

[0128] - After the third instance of exercise run a bath and bathe with the inventive product prepared above

[0129] On each occasion a bath was partially filled with water at a temperature of approximately 15°C. The user immersed themselves in the bath and then placed the product in the bath water. The product effervesced for a number of minutes and released the geosmin fragrance.

[0130] The users were asked to considering their recovery after bathing with each of the known Salt Water Soother product and the inventive product, and with no bath bomb product, and to identify with which did they find their best overall recovery after exercise. Of the 15 users, 6 users indicated that the Salt Water Soother product provides the best overall recovery after exercise and 9 users indicated that the inventive product provides the best overall recovery after exercise. No users indicated that no product provides the best overall recovery after exercise.

[0131] After use of the inventive product the users were asked to rate the next morning on a scale of 1 to 10 (1 being very poor and 10 being excellent) how they found the following: Muscle tiredness, Muscle soreness, Instances of cramp, Joint stiffness, Mental alertness, Mood / Mental wellbeing, Quality of sleep the night after the bath. The mean value for each of these measures is provided in the table below:

[0132] As can be seen, in respect of all measures the inventive product provided advantageous recovery and enhanced mood and mental wellbeing and alertness.

[0133] Various modifications and variations of the present invention will be apparent to those skilled in the art without departing from the scope and spirit of the invention. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various modifications of the described modes for carrying out the invention which are obvious to those skilled in chemistry, biology or related fields are intended to be within the scope of the following claims. References

[0134] Kim, M et al, 2017. ‘Gender Differences in Electroencephalographic Activity in Response to the Earthy Odorants Geosmin and 2-Methylisoborneol’, Applied Sciences, Volume 7, Issue 9.

[0135] Kim, SO et al 2022. ‘Physiological Responses of Adults during Soil-mixing Activities Based on the Presence of Soil Microorganisms: A Metabolomics Approach’, American Society for Horticultural Science, Volume 147, Issue 3.

[0136] Choi NY et al, 2022. ‘Psychophysiological Responses of Humans during Seed-Sowing Activity Using Soil Inoculated with Streptomyces rimosus’, International Journal of Environmental Research and Public Health, Volume 19, Issue 23.

[0137] Marriott BM et al (eds), 1996. ‘Nutritional Needs In Cold And In High-Altitude Environments: Applications for Military Personnel in Field Operations’, Institute of Medicine (US) Committee on Military Nutrition Research; National Academies Press (US) Volume 7.

[0138] Sramek P, 2000. ‘Human physiological responses to immersion into water of different temperatures’, European Journal of Applied Physiology, Volume 81, Issue 5.

[0139] Huttunen, P et al 2004. ‘Winter swimming improves general well-being’, International Journal of Circumpolar Health, Volume 63, Issue 2.

[0140] Esperland D, et al 2022. ‘Health effects of voluntary exposure to cold water - a continuing subject of debate’, International Journal of Circumpolar Health, Volume 81, Issue 1.

[0141] Park YS, et al 1983. ‘Time course of deacclimatization to cold water immersion in Korean women divers’, Journal of applied physiology: respiratory, environmental and exercise physiology, Volume 54, Issue 6.

Claims

CLAIMS1. A solid cosmetic product comprising geosmin.

2. A solid cosmetic product according to claim 1 wherein the solid cosmetic product comprises a carbon dioxide effervescent component which effervesces on contact with water.

3. A solid cosmetic product according to claim 2 wherein the wherein the solid cosmetic product consists of the carbon dioxide effervescent component.

4. A solid cosmetic product according to claim 2 or 3 wherein the carbon dioxide effervescent component comprises a salt of carbonic acid; and an acidifying agent.

5. A solid cosmetic product according to claim 4 wherein the salt of carbonic acid and the acidifying agent are present in a weight ratio of from 90:10 to 50:50.

6. A solid cosmetic product according to claim 4 or 5 wherein the salt of carbonic acid and the acidifying agent are present in a weight ratio of from 90:10 to 70:30.

7. A solid cosmetic product according to any one of claims 4 to 6 wherein the salt of carbonic acid is selected from alkali metal carbonates, alkali metal bicarbonates and mixtures thereof.

8. A solid cosmetic product according to any one of claims 4 to 7 wherein the salt of carbonic acid is selected from sodium bicarbonate, sodium carbonate and mixtures thereof.

9. A solid cosmetic product according to any one of claims 4 to 8 wherein the acidifying agent is selected from monocarboxylic acids, dicarboxylic acids, tricarboxylic acids and mixtures thereof.

10. A solid cosmetic product according to any one of claims 4 to 9 wherein the acidifying agent is selected citric acid, potassium bitartrate (cream of tartar) and mixtures thereof.

11. A solid cosmetic product according to any one of the preceding claims wherein the solid cosmetic product comprises sodium chloride, magnesium sulphate or a mixture thereof.

12. A solid cosmetic product according to any one of claims 2 to 10 wherein the carbon dioxide effervescent component comprises sodium chloride, magnesium sulphate or a mixture thereof.

13. A solid cosmetic product according to any one of the preceding claims wherein the carbon dioxide effervescent component comprises sodium bicarbonate in an amount of from 25 to 70 wt% based on the carbon dioxide effervescent component; and citric acid in an amount of from 5 to 35 wt% based on the carbon dioxide effervescent component.

14. A solid cosmetic product according to any one of claims 11 to 13 wherein the carbon dioxide effervescent component comprises sodium chloride in an amount of from 5 to 45 wt% based on the carbon dioxide effervescent component.

15. A solid cosmetic product according to any one of claims 11 to 14 wherein the carbon dioxide effervescent component comprises magnesium sulphate in an amount of from 5 to 45 wt% based on the carbon dioxide effervescent component.

16. A solid cosmetic product according to any one of the preceding claims wherein the solid cosmetic product comprises sodium bicarbonate in an amount of from 25 to 70 wt% based on the solid cosmetic product; and citric acid in an amount of from 5 to 35 wt% based on the solid cosmetic product.

17. A solid cosmetic product according to any one of claims 11 to 16 wherein the solid cosmetic product comprises sodium chloride in an amount of from 5 to 45 wt% based on the solid cosmetic product.

18. A solid cosmetic product according to any one of claims 11 to 17 wherein the solid cosmetic product comprises magnesium sulphate in an amount of from 5 to 45 wt% based on the solid cosmetic product.

19. A solid cosmetic product according to any one of claims 2 to 18 wherein the carbon dioxide effervescent component comprises(a) a salt of carbonic acid;(b) an acidifying agent comprising citric acid and cream of tartar, wherein the weight ratio of citric acid to cream of tartar is from about 4:1 to about 1 :7.

20. A solid cosmetic product according to any one of the preceding claims wherein the solid cosmetic contains geosmin in an amount of from 0.00005 to 0.01 wt% based on the solid cosmetic product.

21. A solid cosmetic product according to any one of the preceding claims wherein the solid cosmetic product further comprises a colouring.

22. A solid cosmetic product according to claim 21 wherein the solid cosmetic product comprises a water soluble colouring.

23. A solid cosmetic product according to claim 21 or 22 wherein the solid cosmetic product comprises colouring in an amount of from 0.001 to 5 wt% based on the solid cosmetic product.

24. A solid cosmetic product according to any one of the preceding claims wherein the product is a bathing product.

25. A solid cosmetic product comprising(a) sodium bicarbonate in an amount of from 25 to 70 wt% based on the solid cosmetic product;(b) citric acid in an amount of from 5 to 35 wt% based on the solid cosmetic product;(c) sodium chloride in an amount of from 5 to 45 wt% based on the solid cosmetic product; and(d) magnesium sulphate in an amount of from 5 to 45 wt% based on the solid cosmetic product.

26. A solid cosmetic product according to claim 25 further comprising geosmin.

27. A solid cosmetic product as defined in any one of claims 1 to 26 for use to provide bathing water after exercise for one or more of reducing muscle tiredness, reducing muscle soreness, reducing instances of cramp, reducing joint stiffness, improving mental alertness, improving mood, improving mental wellbeing, improving quality of sleep.

28. A solid cosmetic product for use according to claim 27 wherein after exercise the user bathes in water in which the solid cosmetic product has been dispersed, and wherein the temperature of the water is no greater than 20°C, such as no greater than 15°C, such as from 5 to 15°C.

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