A composition having an improved skin color effect and a method for preparing the same

Abstract

This invention belongs to the field of cosmetic technology, specifically relating to a composition with skin-improving effects and its preparation method. The skin-improving composition provided by this invention includes extracts of *Melaleuca lanceolata*, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carobella vulgaris* fruit extract, and tranexamic acid. These five components have a synergistic effect, effectively increasing the composition's inhibition rate against tyrosinase. This skin-improving composition can be used in the preparation of skincare products such as face creams, significantly enhancing the skin-brightening and whitening effects of face creams, and is gentle and non-irritating, possessing broad market application value.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology, specifically relating to a composition that improves skin tone and its preparation method. Background Technology

[0002] As the first line of defense between the human body and the external environment, the condition of the skin not only reflects an individual's health level but also directly affects their appearance. With age, a faster pace of life, and increased environmental stress, skin often experiences problems such as dullness, pigmentation, decreased elasticity, and reduced radiance. The reasons for these phenomena are as follows: long-term exposure to ultraviolet or blue light radiation leads to the accumulation of large amounts of free radicals in the body, causing lipid peroxidation damage and resulting in skin damage and aging; poor lifestyle habits, high-sugar diets, and endocrine disorders disrupt the body's metabolic balance, causing poor internal circulation; simultaneously, the skin's own collagen synthesis capacity declines significantly with age, further accelerating uneven skin tone.

[0003] To address these issues, existing skincare products claiming to improve skin tone often employ chemically active ingredients such as vitamin C derivatives, salicylic acid, and retinol. While these may provide some brightening or anti-aging effects in the short term, they generally carry risks such as strong irritation, allergic reactions, post-treatment hyperpigmentation, or skin barrier damage. Some skincare products are primarily based on plant extracts. Although these ingredients are natural and gentle, their actual efficacy is limited due to low concentrations of active ingredients, large molecular weights, poor transdermal absorption, or improper extraction processes and formulation ratios. This makes it difficult to meet consumers' dual demands for "high efficacy and safety."

[0004] Therefore, there is an urgent need to develop a highly effective and gentle composition that can improve skin tone. By scientifically screening active ingredients and precisely controlling the ratio, it can achieve a systematic improvement on multiple skin problems such as dull skin tone, pigmentation, and oxidative stress, thereby filling the current market gap. Summary of the Invention

[0005] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a composition with skin tone improvement effect and its preparation method, which solves the problems of poor effect and strong irritation of existing skin tone improvement skin care products.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a composition having the effect of improving skin tone, comprising the following components in parts by weight:

[0008] 2-5 parts of *Lycopodium clavatum* extract;

[0009] 3-7 parts of green-flowered white melaleuca leaf oil;

[0010] Nasturtium extract 6-12 parts;

[0011] 5-11 parts of carob fruit extract;

[0012] Tranexamic acid 3-10 parts.

[0013] The extract of *Lysimachia christinae* contains a relatively high amount of indole alkaloids, as well as α-amyrin acetate, lupinyl acetate, volatile oils, and other components, which have antibacterial, anti-inflammatory, antitussive, analgesic, and expectorant effects.

[0014] The leaf oil of Melaleuca odorata is rich in monoterpenoids and sesquiterpenoids, mainly including monoterpenoid oxides, monoterpenoid alkenes, monoterpenoid alcohols, and sesquiterpenoid alcohols. It has strong anti-inflammatory, soothing, antibacterial, antioxidant, and oil-controlling abilities.

[0015] Nasturtium extract contains glucosinolates, isothiocyanates, flavonoids, vitamin C, carotenoids, and other components, and has antioxidant, anti-photoaging, anti-inflammatory, soothing, and antibacterial effects.

[0016] Carob fruit extract contains active ingredients such as polyphenols, flavonoids, oligosaccharides, trace minerals and amino acids. It has powerful anti-glycation, antioxidant, soothing, anti-inflammatory, moisturizing and barrier repair capabilities, and is gentle and hypoallergenic.

[0017] Tranexamic acid, also known as aminomethyl tranexamic acid, is a synthetic amino acid that can effectively reduce existing melanin deposits and promote the shedding of existing melanin. It mainly interferes with the formation of melanin and prevents the transport of melanin by melanocytes to achieve a whitening effect. It fundamentally inhibits the formation of melanin and has a long-lasting whitening effect.

[0018] Preferably, the composition having skin-improving effects comprises the following components in parts by weight:

[0019] Three portions of *Lycopodium clavatum* extract;

[0020] 5 parts of green-flowered white melaleuca leaf oil;

[0021] Nine parts of nasturtium extract;

[0022] 8 parts carob fruit extract;

[0023] Tranexamic acid 7 parts.

[0024] Secondly, the present invention provides the use of the composition with skin tone improvement effect described in the first aspect in the preparation of skin tone improvement products.

[0025] Preferably, the dosage form of the skin care product is a cream, lotion, liquid, gel, or mask.

[0026] Thirdly, the present invention provides a face cream comprising the following ingredients by weight percentage: 1.5%-3% of the composition with skin tone-improving effects described in the first aspect, 7%-12% of moisturizer, 1.5%-8% of thickener, 3%-11% of emollient, 2%-11% of emulsifier, 0.5%-1.5% of preservative, and the balance being deionized water.

[0027] Preferably, the moisturizer is selected from at least one of trehalose, betaine, sorbitol, xylitol, inositol, hyaluronic acid, glycerin, allantoin, 1,3-propanediol, 1,2-pentanediol, butylene glycol, and 1,2-hexanediol.

[0028] Preferably, the thickener is selected from at least one of behenol, behenic acid, cellulose, carbomer, xanthan gum, gum arabic, sclerotium gum, and cetyl alcohol.

[0029] Preferably, the emollient is selected from at least one of jojoba seed oil, coconut oil, squalane, olive fruit oil, and meadowfoam seed oil.

[0030] Preferably, the emulsifier is selected from at least one of arachidonic acid glucoside, glyceryl stearate, PEG-100 stearate, hydrogenated lecithin, and lecithin.

[0031] Preferably, the preservative is selected from at least one of pentylene glycol, methylparaben, propylparaben, phenoxyethanol, sodium benzoate, and potassium sorbate.

[0032] Fourthly, the present invention provides a method for preparing the face cream described in the third aspect, comprising the following steps:

[0033] S1. Mix the humectant, thickener and deionized water, and stir at 70-85℃ and 200-300rpm to obtain the aqueous phase;

[0034] S2. Mix the emollient and emulsifier, and stir at 70-85℃ and 200-300rpm to obtain the oil phase;

[0035] S3. After adding the oil phase to the aqueous phase, homogenize and mix well, cool to 40-45℃, add the preservative and each component of the composition with skin tone-improving effect, homogenize and mix well to obtain the face cream.

[0036] The beneficial effects of this invention are:

[0037] The skin-improving composition provided by this invention is composed of five components: *Melaleuca lanceolata* extract, *Melaleuca leucantha* leaf oil, *Tropaeolum majus* extract, *Carob fruit* extract, and tranexamic acid. These five components have a synergistic effect, effectively increasing the inhibition rate of the composition against tyrosinase. When this skin-improving composition is applied to skincare products such as face creams, it can significantly improve the skin-brightening and whitening effects of the face cream, and is gentle and non-irritating, thus having broad market application value. Detailed Implementation

[0038] To further illustrate the technical means and effects of the present invention in achieving the intended purpose, the following detailed description of the specific embodiments, structure, features and effects of the present invention, in conjunction with the composition, is provided below.

[0039] For the following compositions, unless otherwise specified, experimental methods are generally performed under standard conditions or as recommended by the manufacturer. Unless otherwise specified, all materials and reagents used are commercially available.

[0040] Some of the raw materials and their sources are as follows:

[0041] The extract from *Lycopodium clavatum* was purchased from Xi'an Senran Bioengineering Co., Ltd.

[0042] The leaf oil of Melaleuca odorata was purchased from Shenzhen Shanfu Fragrance International Biotechnology Co., Ltd.

[0043] The nasturtium extract was purchased from Meite (Hubei) New Materials Co., Ltd.

[0044] The carob fruit extract was purchased from Wuhan Kemic Biomedical Technology Co., Ltd.

[0045] Transurethric acid was purchased from Guangzhou Yueze Chemical Co., Ltd.

[0046] The component composition (parts by weight) of the compositions with skin-improving effects in Examples 1-3 of this invention is shown in Table 1 below. Each component was weighed according to the formula amount, mixed and homogenized to obtain each composition.

[0047] Table 1. Components and their weight parts of the compositions in Examples 1-3

[0048] Example Lampstand Tree Extract (parts by weight) Green-flowered white neem leaf oil (parts by weight) Nasturtium extract (parts by weight) Carob fruit extract (parts by weight) Tranexamic acid (parts by weight) 1 5 7 12 11 10 2 2 3 6 5 3 3 3 5 9 8 7

[0049] Comparative Example 1

[0050] Compared with Example 3, the difference is that the extract of *Melaleuca laurentii* was not added in Comparative Example 1. The missing amount was made up by the addition of leaf oil of *Melaleuca laurentii*, extract of *Tropaeolum majus*, extract of *Carobella fuciformis* fruit and tranexamic acid in a weight ratio of 5:9:8:7. All other conditions and preparation methods were the same as in Example 3.

[0051] Comparative Example 2

[0052] Compared with Example 3, the difference is that no Melaleuca odorata leaf oil was added in Comparative Example 2, and the missing amount was made up by extracts of Dendrobium nobile, Nasturtium spp., Carob fruit extract and tranexamic acid in a weight ratio of 3:9:8:7. All other conditions and preparation methods were the same as in Example 3.

[0053] Comparative Example 3

[0054] Compared with Example 3, the difference is that Nasturtium extract was not added in Comparative Example 3. The missing amount was made up by extracts of *Melaleuca lanceolata*, *Melaleuca pubescens* leaf oil, *Carob fruit* extract and tranexamic acid in a weight ratio of 3:5:8:7. All other conditions and preparation methods were the same as in Example 3.

[0055] Comparative Example 4

[0056] Compared with Example 3, the difference is that the long-horned bean fruit extract was not added in Comparative Example 4. The missing amount was made up by extracts of *Melaleuca lanceolata*, *Melaleuca pubescens* leaf oil, *Tropaeolum majus* extract and tranexamic acid in a weight ratio of 3:5:9:7. All other conditions and preparation methods were the same as in Example 3.

[0057] Comparative Example 5

[0058] Compared with Example 3, the difference is that tranexamic acid was not added in Comparative Example 5, and the missing amount was made up by extracts of *Melaleuca lanceolata*, *Melaleuca pubescens* leaf oil, *Tropaeolum majus* extract and *Carobella vulgaris* fruit extract in a weight ratio of 3:5:9:8. All other conditions and preparation methods were the same as in Example 3.

[0059] Comparative Example 6

[0060] Compared with Example 3, the difference is that in Comparative Example 6, the weight ratio of *Lysimachia christinae* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carob fruit* extract, and tranexamic acid is 9:5:3:8:7, while other conditions and preparation methods are the same as in Example 3.

[0061] Comparative Example 7

[0062] Compared with Example 3, the difference is that in Comparative Example 7, the weight ratio of *Lysimachia christinae* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carob fruit* extract, and tranexamic acid is 3:8:9:5:7, while other conditions and preparation methods are the same as in Example 3.

[0063] Example 1: Tyrosinase Activity Inhibition Rate Test

[0064] In the biosynthesis of melanin, tyrosinase, as a key rate-limiting enzyme, catalyzes the hydroxylation of L-tyrosine to produce 3,4-dihydroxyphenylalanine (L-DOPA), which is then further oxidized to dopaquinone. Subsequently, dopaquinone undergoes spontaneous cyclization and polymerization reactions without enzymatic catalysis, ultimately forming melanin. Therefore, the rate of dopaquinone formation can be quantitatively characterized by measuring the change in absorbance of the reaction system at a wavelength of 475 nm, thereby assessing the inhibitory effect of the analyte on the catalytic activity of tyrosinase.

[0065] This efficacy test example refers to "T / GDCA006-2021 Test method for inhibition of tyrosinase activity by cosmetic raw materials (in vitro method)" to detect the inhibition rate of tyrosinase activity of the compositions prepared in Examples 1-3 and Comparative Examples 1-7 of this application, thereby evaluating the inhibitory ability of the compositions on tyrosinase activity.

[0066] The specific experimental procedure is as follows:

[0067] 1.1 Preparation of sample solutions: The compositions prepared in Examples 1-3 and Comparative Examples 1-7 were diluted with PBS buffer to a concentration of 1.0 mg / mL to obtain sample solutions.

[0068] 1.2 Grouping: Four groups of wells were set up in the 96-well microplate, with solvent background wells (T... a Add 40 μL of solvent (i.e., PBS buffer) and 70 μL of PBS buffer to the solvent reaction well (T). b Add 40 μL of L-tyrosine solution, 40 μL of solvent (i.e., PBS buffer), and 30 μL of PBS buffer to the sample background well (T). c Add 40 μL of sample solution and 70 μL of PBS buffer to the sample reaction well (T). d Add 40 μL of L-tyrosine solution, 40 μL of sample solution and 30 μL of PBS buffer, and perform three replicates for each group;

[0069] 1.3 Reaction: Mix thoroughly in each well, incubate at 37℃ for 10 min, then add 20 μL of tyrosinase solution to each well sequentially, mix well at 37℃ for 5 min.

[0070] 1.4 Measurement and Calculation: After the reaction is complete, immediately place the sample in an ELISA reader and measure the absorbance at a wavelength of 475 nm. Calculate the tyrosinase activity inhibition rate using the following formula:

[0071] ;

[0072] In the formula: Y is the inhibition rate of tyrosinase activity; A aA represents the average absorbance of the solvent background pores. b A represents the average absorbance of the solvent reaction wells; c A represents the absorbance of the sample's bottom well. d The absorbance of the sample reaction well;

[0073] The specific results are taken as averages, as shown in Table 2.

[0074] Table 2 Tyrosinase inhibition rate data

[0075] Group Tyrosinase inhibition rate (%) Example 1 92.01 Example 2 91.24 Example 3 93.17 Comparative Example 1 74.62 Comparative Example 2 66.17 Comparative Example 3 73.10 Comparative Example 4 71.23 Comparative Example 5 69.18 Comparative Example 6 82.71 Comparative Example 7 84.69

[0076] Compared with Example 3, Comparative Examples 1-5 did not contain one of the following: *Melaleuca lanceolata* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carobella fuciformis* fruit extract, and tranexamic acid. Comparative Examples 6-7 adjusted the weight ratio of *Melaleuca lanceolata* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carobella fuciformis* fruit extract, and tranexamic acid.

[0077] As shown in Table 2, the tyrosinase inhibition rate data of Example 3 and Comparative Examples 1-5 indicate that the composition of Example 3, prepared by combining five components—*Melaleuca lanceolata* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carob chinensis* fruit extract, and tranexamic acid—has an excellent tyrosinase inhibition effect. This suggests that the five components have a synergistic effect, resulting in a significant improvement in the tyrosinase inhibition effect of the composition of Example 3 compared to Comparative Examples 1-5.

[0078] As shown in Table 2, the tyrosinase inhibition rate data of Examples 1-3 and Comparative Examples 6-7 indicate that the composition exhibits better tyrosinase inhibition when the weight ratio of *Melaleuca lanceolata* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carob davidii* fruit extract, and tranexamic acid is (2-5):(3-7):(6-12):(5-11):(3-10); and the composition shows the best tyrosinase inhibition effect when the weight ratio of *Melaleuca lanceolata* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carob davidii* fruit extract, and tranexamic acid is 3:5:9:8:7.

[0079] Application example: A face cream with skin-improving effects

[0080] The compositions of Examples 1-3 and Comparative Examples 1-7 were added to face creams to obtain face creams of Application Examples 1-3 and Comparative Application Examples 1-7, respectively.

[0081] The face cream with skin-improving effects comprises the following components in weight percentage: 2% of the skin-improving composition, 10% trehalose, 6% xanthan gum, 9% jojoba seed oil, 10% lecithin, 1% potassium sorbate, and the balance being deionized water.

[0082] The preparation method of the face cream with skin tone improvement effect specifically includes the following steps:

[0083] S1. Mix trehalose, xanthan gum and deionized water, and stir at 75°C and 250 rpm to obtain an aqueous phase.

[0084] S2. Mix jojoba seed oil and lecithin, and stir at 75°C and 250 rpm to obtain the oil phase.

[0085] S3. After adding the oil phase to the aqueous phase, homogenize and mix well, cool to 45°C, add potassium sorbate and each component of the composition with skin tone-improving effects, homogenize and mix well to obtain the face cream.

[0086] Blank application example: Compared with application examples 1-3, the difference is that the face cream in the blank application example does not contain a composition that improves skin tone, and uses an equal amount of deionized water instead of the composition. The preparation method is the same as that in application examples 1-3.

[0087] Example 2 of the effect test: Skin tone improvement effect test

[0088] This effect test examines the effects of face creams prepared in Application Examples 1-3, Comparative Application Examples 1-7, and Blank Application Example on improving skin tone.

[0089] The specific testing method is as follows:

[0090] Fifty-five female volunteers (aged 22-28) with normal skin were selected and evenly divided into 11 groups of 5. Each group used face creams prepared for application examples 1-3, control examples 1-7, and a blank application example, respectively. Under normal conditions, the volunteers continuously used the product on their entire face for 28 days. Each morning and evening, after cleansing and moisturizing, volunteers applied 1g of face cream to their face and massaged it in until absorbed. Follow-up visits were conducted before and after 28 days of use. On the day of the visit, volunteers cleansed their faces without applying any product and sat quietly for 20 minutes in an air-conditioned room with a temperature of 21±1℃ and humidity of 50±10%. A skin color testing probe (Colorimeter) was used. The CL400 collects facial brightness (L value) and skin tone individual type angle (ITA° value); the L value represents the skin's lightness and darkness, and the larger the value, the brighter the skin; the ITA° value represents the overall skin tone, and the larger the value, the whiter the skin. The improvement rate of the L value and ITA° value is calculated according to the following formula, and the calculation results are expressed as average values, as shown in Table 3.

[0091]

[0092] In the formula:

[0093] X 使用前The L value or ITA° value of each group of volunteers before using the face cream;

[0094] X 使用28天后 The L value or ITA° value of each group of volunteers after 28 days of using the face cream;

[0095] Table 3 Human Efficacy Data

[0096] Group L-value improvement rate (%) ITA° value improvement rate (%) Blank application example 0.52 7.14 Application Example 1 7.21 25.83 Application Example 2 6.79 24.16 Application Example 3 7.83 26.35 Comparative Application Example 1 5.10 18.79 Comparative Application Example 2 3.38 15.42 Comparative Application Example 3 4.71 17.38 Comparative Application Example 4 4.25 16.29 Comparative Application Example 5 3.86 14.87 Comparative Application Example 6 5.84 22.41 Comparative Application Example 7 6.09 23.11

[0097] Compared with Application Example 3, Comparative Application Examples 1-5 did not add one of the following: *Melaleuca lanceolata* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carobella fuciformis* fruit extract, and tranexamic acid. Comparative Application Examples 6-7 adjusted the weight ratio of *Melaleuca lanceolata* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carobella fuciformis* fruit extract, and tranexamic acid.

[0098] The data in Table 3 showing the improvement rates of L value and ITA° value between Application Example 3 and Comparative Application Examples 1-5 indicate that the face cream in Application Example 3, prepared by combining five components—Tetracentron sinense extract, Melaleuca odorata leaf oil, Nasturtium spp. extract, Carob fruit extract, and tranexamic acid—has excellent skin brightening and whitening effects. This suggests that the five components have a synergistic effect, enabling the face cream in Application Example 3 to effectively brighten skin tone.

[0099] The data in Table 3 regarding the improvement rates of L-value and ITA° value in Application Examples 1-3 and Comparative Examples 6-7 show that the composition exhibits better skin tone improvement when the weight ratio of *Cephalotaxus fortunei* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carob fruit extract*, and tranexamic acid is (2-5):(3-7):(6-12):(5-11):(3-10); and the composition shows the best skin tone improvement effect when the weight ratio of *Cephalotaxus fortunei* extract, *Melaleuca leucocephala* leaf oil, *Tropaeolum majus* extract, *Carob fruit extract*, and tranexamic acid is 3:5:9:8:7.

[0100] Example 3 of efficacy test: Human skin patch test

[0101] This efficacy test example refers to the relevant requirements and test methods of "Human Skin Patch Test" as shown in the "Cosmetic Safety Technical Specifications" (2015 edition) to evaluate the safety of the face creams prepared by application examples 1-3 and blank application examples of this invention, and to test the potential possibility of the test samples causing adverse reactions on human skin.

[0102] The specific experimental steps are as follows:

[0103] Forty volunteers, half male and half female, aged 20-35 years, without inflammatory skin diseases or highly sensitive constitutions, were selected and randomly divided into four groups of 10 each. The skin on the flexor surface of the forearm, the test site, was cleaned and kept dry. 0.025g of the test sample (face cream prepared in Examples 1-3 and the blank application example) was weighed and placed in the small chamber of the spot applicator. The control well served as a blank control (without any substance). The spot applicator containing the test sample was applied to the flexor surface of the volunteer's forearm using hypoallergenic adhesive tape, and the palm was gently pressed to ensure even application to the skin for 24 hours. Skin reactions were observed 30 minutes (after the pressure marks disappeared), 6 hours, 12 hours, 24 hours, and 48 hours after removing the spot applicator, and the results were recorded according to the standards in Table 4.

[0104] Table 4. Grading Criteria for Skin Reaction in Occlusive Patch Tests

[0105]

[0106] Human skin patch test results showed that all volunteers in application groups 1-3 and the blank application group had negative results and no adverse skin reactions, indicating that the face cream prepared using the composition of the present invention will not cause allergic reactions, is non-irritating to the skin and has high safety, and can be widely used in commercial production.

[0107] The above description is merely a preferred composition of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with preferred compositions, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent compositions without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above compositions based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A composition having the effect of improving skin tone, characterized in that, Composed of the following components in parts by weight: 2-3 parts of *Lycopodium clavatum* extract; 3-5 parts of green-flowered white melaleuca leaf oil; Nasturtium extract 6-9 parts; 5-8 parts carob fruit extract; Tranexamic acid 3-7 parts.

2. The composition with skin-improving effects as described in claim 1, characterized in that, Composed of the following components in parts by weight: Three portions of *Lycopodium clavatum* extract; 5 parts of oil from the leaves of the green-flowered white melaleuca; Nine parts of nasturtium extract; 8 parts carob fruit extract; Tranexamic acid 7 parts.

3. The use of the composition with skin tone improvement effect as described in claim 1 or 2 in the preparation of skin care products with skin tone improvement effect.

4. The application as described in claim 3, characterized in that, The dosage form of the skin care products is cream, lotion, water, gel, or mask.

5. A face cream, characterized in that, The face cream comprises the composition with skin-improving effects as described in claim 1 or 2.

6. The face cream as described in claim 5, characterized in that, The face cream comprises the following ingredients by weight percentage: 1.5%-3% of the composition with skin-improving effects as described in claim 1 or 2, 7%-12% of moisturizer, 1.5%-8% of thickener, 3%-11% of emollient, 2%-11% of emulsifier, 0.5%-1.5% of preservative, and the balance being deionized water.

7. The face cream as described in claim 6, characterized in that, The moisturizer is selected from at least one of trehalose, betaine, sorbitol, xylitol, inositol, hyaluronic acid, glycerin, allantoin, 1,3-propanediol, 1,2-pentanediol, butylene glycol, and 1,2-hexanediol. The thickener is selected from at least one of behenol, behenic acid, cellulose, carbomer, xanthan gum, gum arabic, sclerotium gum, and cetyl alcohol; The emollient is selected from at least one of jojoba seed oil, coconut oil, squalane, olive fruit oil, and meadowfoam seed oil; The emulsifier is selected from at least one of arachidonic acid glucoside, glyceryl stearate, PEG-100 stearate, hydrogenated lecithin, and lecithin. The preservative is selected from at least one of methylparaben, propylparaben, phenoxyethanol, sodium benzoate, and potassium sorbate.

8. The method for preparing the face cream as described in claim 6 or 7, characterized in that, Includes the following steps: S1. Mix the humectant, thickener and deionized water, and stir at 70-85℃ and 200-300rpm to obtain the aqueous phase; S2. Mix the emollient and emulsifier, and stir at 70-85℃ and 200-300rpm to obtain the oil phase; S3. After adding the oil phase to the aqueous phase, homogenize and mix well, cool to 40-45℃, add the preservative and each component of the composition with skin tone-improving effect, homogenize and mix well to obtain the face cream.

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