A skin-brightening composition containing Camellia japonica flower extract and its application in the preparation of cosmetics suitable for dry and sensitive skin.

Abstract

This invention relates to a skin-brightening composition containing Camellia chrysantha flower extract and its application in the preparation of cosmetics suitable for dry and sensitive skin. The composition comprises the following components: Camellia chrysantha flower extract, Elm scabra bark extract, oat kernel protein, and Suizenji nori polysaccharide, wherein the weight ratio of Camellia chrysantha flower extract, Elm scabra bark extract, oat kernel protein, and Suizenji nori polysaccharide is (1-10):(1-8):(0.1-1):(0.01-0.1). This composition achieves optimal long-lasting brightening, barrier repair, and soothing effects.

Description

Technical Field

[0001] This invention relates to the technical field of cosmetics, specifically to a skin-brightening composition containing Camellia japonica flower extract and its application in the preparation of cosmetics suitable for dry and sensitive skin. Background Technology

[0002] Dry, sensitive skin (also known as dry-sensitive skin) refers to skin that is both dry and dehydrated, and highly sensitive, easily affected by external stimuli (such as climate change, chemical components, etc.), resulting in discomfort such as redness, inflammation, and cracking. This type of skin usually has a dull complexion and is prone to uneven skin tone or post-inflammatory hyperpigmentation. Therefore, research on brightening dry, sensitive skin needs to focus on how to improve uneven skin tone, brighten the complexion, and repair the skin barrier while avoiding irritation.

[0003] Currently, common skin-brightening ingredients include niacinamide and tranexamic acid, but these can cause irritation to some sensitive skin types, especially at higher concentrations, potentially leading to stinging, redness, and other discomfort. They also require prolonged use to see results, and some products may require complex application methods. Hyaluronic acid and ceramides, on the other hand, primarily focus on moisturizing, offering relatively gentle brightening effects. However, they need to be used in conjunction with other brightening ingredients to achieve noticeable results. Intense pulsed light (IPL) and laser treatments can cause strong irritation to dry and sensitive skin, potentially damaging the skin barrier. These treatments should be conducted under the guidance of a professional physician, are expensive, and usually require multiple sessions. Therefore, brightening solutions for dry and sensitive skin should prioritize gentleness and repair, incorporating suitable brightening ingredients, avoiding irritation, and carefully monitoring skin feedback and tolerance during application. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a skin-brightening composition containing Camellia japonica flower extract and its application in the preparation of cosmetics suitable for dry and sensitive skin.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] In a first aspect, the present invention provides a skin-brightening composition containing Camellia chrysantha extract, comprising the following components: Camellia chrysantha extract, Elm bark extract, oat kernel protein and Suizenji nori polysaccharide, wherein the weight ratio of Camellia chrysantha extract, Elm bark extract, oat kernel protein and Suizenji nori polysaccharide is (1-10):(1-8):(0.1-1):(0.01-0.1).

[0007] The main chemical components in Camellia chrysantha flower extract include flavonoids, tea polyphenols, tea polysaccharides, saponins, trace elements, amino acids, and fibrous lipids, which can exert multiple effects such as anti-oxidation, anti-inflammation, and enhancing skin barrier function. For example, tea polyphenols and flavonoids in Camellia chrysantha have strong antioxidant effects, which can reduce oxidative stress, prevent free radical damage to the skin, and alleviate skin aging and allergic reactions caused by inflammation. In particular, polyphenols have been shown to inhibit PAR2 receptors, and flavonoids are one of the sources of TRPV1 inhibitors. Amino acids are basic components of skin structure and can promote the synthesis of the stratum corneum and repair the damaged skin barrier. Trace elements play an important role in skin repair and anti-oxidation. They participate in skin cell metabolism, promote collagen synthesis, help maintain skin elasticity and structure, and enhance the skin barrier's repair ability.

[0008] The bark extract of *Anogeissus Leiocarpa* is rich in polysaccharides. These natural macromolecules typically function in plants by storing energy, supporting plant structure, and providing protection against adverse conditions such as drought and cold. When applied to the skin, polysaccharides can enhance the skin's barrier function, prevent moisture loss, and isolate harmful external substances. They also promote skin cell regeneration and repair, helping to repair a damaged skin barrier. Furthermore, the bark extract of *Anogeissus Leiocarpa* is rich in flavonoids, a class of potent natural antioxidants that scavenge free radicals, reducing redness, inflammation, and other discomfort, making it suitable for sensitive and easily irritated skin.

[0009] The amino acids and antioxidants in oat kernel protein can promote skin cell repair and regeneration, improve the skin's barrier function, and reduce the invasion of harmful external substances. In addition, the natural saponins in oat kernel protein can gently remove excess oil and dirt from the skin's surface, leaving the skin brighter and more radiant.

[0010] The polysaccharide components of *Aphanotece sacrificialus* mainly include monosaccharides such as glucose, galactose, mannose, and rhamnose, which are linked by glycosidic bonds to form a complex sugar chain structure. This structure exhibits good solubility, allowing for absorption by the human body and skin. It forms a relatively stable film on the skin and possesses various biological functions. The polysaccharide molecules of *Aphanotece sacrificialus* are rich in hydroxyl groups, which can bind with water through hydrogen bonds to form a highly water-retaining hydration layer. This layer forms a thin film on the skin surface, locking in moisture and enhancing skin hydration. *Aphanotece sacrificialus* polysaccharides can also help relieve skin discomfort by inhibiting inflammatory responses, especially for skin exposed to prolonged ultraviolet radiation, dryness, or air pollution.

[0011] The composition of this invention, through the synergistic action of four components—Camellia chrysantha flower extract, Elm bark extract, oat kernel protein, and Suizenji nori polysaccharide—provides skin cells with a variety of nutrients, effectively promoting the transport and absorption of vitamin C in dermal cells. It not only has synergistic antioxidant and anti-inflammatory effects, but also enhances skin hydration and protects the skin from irritation. The mechanisms of action are complementary, and the efficacy achieves optimal long-lasting brightening, barrier repair, and soothing effects in clinical practice.

[0012] Preferably, the weight ratio of the Camellia chrysantha flower extract, the elm bark extract, the oat kernel protein, and the Porphyra yezoensis polysaccharide is (1-8):(1-5):(0.1-0.5):(0.01-0.05).

[0013] More preferably, the weight ratio of the Camellia chrysantha flower extract, the elm bark extract, the oat kernel protein, and the Porphyra yezoensis polysaccharide is (1-5):(1-3):(0.1-0.3):(0.01-0.03).

[0014] In a second aspect, the present invention provides the use of the skin-brightening composition containing Camellia japonica extract from the first aspect in the preparation of cosmetics suitable for dry and sensitive skin.

[0015] Preferably, the cosmetic is a toner, lotion, cream, mask, serum, or spray, and the amount of the composition added is 1%-3% of the total weight of the cosmetic.

[0016] Thirdly, the present invention provides an essence comprising the following ingredients by weight percentage: 1%-3% of the skin brightening composition described in the first aspect, 0.05%-0.5% of a thickener, 3%-20% of a moisturizer, 0.2%-5% of a preservative, 0.05%-0.1% of a pH adjuster, and 0.01%-1% of a fragrance, with the balance being deionized water.

[0017] Preferably, the thickener includes at least one of xanthan gum, carbomer 940, AVC, and high molecular weight cellulose.

[0018] Preferably, the moisturizer includes at least one of allantoin, sodium polyacrylate, hydrogenated lecithin, betaine, β-glucan, trehalose, caprylyl glycol, dipropylene glycol, sodium hyaluronate, 1,2-butanediol, glycerin, budding stalk polysaccharide, and ceramide.

[0019] Preferably, the pH adjuster includes arginine and / or sodium hydroxide.

[0020] Preferably, the preservative includes at least one of 1,2-propanediol, 1,2-hexanediol, and p-hydroxyacetophenone.

[0021] Fourthly, the present invention improves the method for preparing the essence described in the third aspect, comprising the following steps:

[0022] S1. Mix the humectant, thickener and part of the deionized water, homogenize at 75-85℃, then add the preservative and stir evenly to obtain the mixture.

[0023] S2. When the temperature of the mixture in S1 drops to 35-45℃, add the components of the skin brightening composition, fragrance and remaining deionized water, stir well, and finally add pH adjuster to adjust the pH to obtain the essence.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The skin-brightening composition of this invention comprises four components: Camellia chrysantha flower extract, Elm bark extract, oat kernel protein, and Suizenji nori polysaccharide. These components work synergistically to provide skin cells with a variety of nutrients, effectively promoting the transport and absorption of Vitamin C in dermal cells. They not only have synergistic antioxidant and anti-inflammatory effects, but also enhance skin hydration and protect the skin from irritation. Their mechanisms of action are complementary, and their efficacy achieves optimal long-lasting brightening, barrier repair, and soothing effects in clinical practice. Attached Figure Description

[0026] Figure 1 A comparison chart of skin redness on day 0 and day 14 for subjects using the serum in Application Example 1.

[0027] Figure 2 A comparison of skin redness on day 0 and day 14 using the serum from Comparative Application Example 5 (blank control group);

[0028] Figure 3 A comparison of skin brightness on day 0 and day 14 for subjects using the serum in Application Example 1;

[0029] Figure 4 A comparison chart of skin brightness on day 0 and day 14 using the serum from Comparative Application Example 5 (blank control group); Detailed Implementation

[0030] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0031] The materials used in the following embodiments and comparative examples are from the following sources:

[0032] Extract of smooth-fruited elm bark: manufactured by Guangzhou Aoxue Biotechnology Co., Ltd.

[0033] Oat kernel protein: manufactured by Shaanxi Desert Sanbao Biotechnology Co., Ltd.

[0034] Camellia chrysantha flower extract: manufactured by Ximuyuan (Xiamen) Biotechnology Co., Ltd.;

[0035] Suizenji seaweed polysaccharide: manufactured by Shandong Shoucheng Chemical Co., Ltd.

[0036] Unless otherwise specified, all other materials and reagents used in the examples are commercially available.

[0037] Example 1

[0038] A skin-brightening composition containing Camellia chrysantha flower extract, comprising Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide in a weight ratio of 3:2:0.2:0.02, wherein the total mass fraction of Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide is 100 parts.

[0039] Example 2

[0040] A skin-brightening composition containing Camellia chrysantha flower extract, comprising Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide in a weight ratio of 1:3:0.3:0.01, wherein the total mass parts of the Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide are 100 parts.

[0041] Example 3

[0042] A skin-brightening composition containing Camellia chrysantha flower extract, comprising Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide in a weight ratio of 5:1:0.1:0.03, wherein the total mass parts of the Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide are 100 parts.

[0043] Example 4

[0044] A skin-brightening composition containing Camellia chrysantha flower extract, comprising Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide in a weight ratio of 1:1:0.5:0.05, wherein the total mass parts of the Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide are 100 parts.

[0045] Example 5

[0046] A skin-brightening composition containing Camellia chrysantha flower extract, comprising Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide in a weight ratio of 8:5:0.1:0.01, wherein the total mass parts of the Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide are 100 parts.

[0047] Example 6

[0048] A skin-brightening composition containing Camellia chrysantha flower extract, comprising Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein and Suizenji nori polysaccharide in a weight ratio of 1:8:1:0.1, wherein the total mass parts of Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein and Suizenji nori polysaccharide are 100 parts.

[0049] Example 7

[0050] A skin-brightening composition containing Camellia chrysantha flower extract, comprising Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide in a weight ratio of 10:1:0.1:0.01, wherein the total mass parts of the Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide are 100 parts.

[0051] Comparative Example 1

[0052] The difference between Comparative Example 1 and Example 1 is that the composition does not contain Camellia chrysantha flower extract, but uses smooth elm bark extract, oat kernel protein and Suizenji nori polysaccharide in a mass ratio of 2:0.2:0.02 to make up for the missing amount.

[0053] Comparative Example 2

[0054] The difference between Comparative Example 2 and Example 1 is that the composition does not contain the smooth fruit elm bark extract, but uses Camellia chrysantha flower extract, oat kernel protein and Suizenji nori polysaccharide in a weight ratio of 3:0.2:0.02 to make up for the missing amount.

[0055] Comparative Example 3

[0056] The difference between Comparative Example 3 and Example 1 is that oat kernel protein is not added to the composition, and the missing amount is made up by extracts of Camellia chrysantha, Elm bark extract and Laver polysaccharide in a weight ratio of 3:2:0.02.

[0057] Comparative Example 4

[0058] The difference between Comparative Example 4 and Example 1 is that the composition does not contain Suizenji nori polysaccharide, and uses Camellia chrysantha flower extract, Elm bark extract and oat kernel protein in a weight ratio of 3:2:0.2 to make up for the missing amount.

[0059] Test Example 1: Test on the efficacy of promoting vitamin C absorption

[0060] The compositions of Examples 1-7 and Comparative Examples 1-4 were set as 11 test sample groups, and the experiments were carried out according to the following steps:

[0061] (1) Cell Culture: Human dermal fibroblasts (HDF) were cultured in Duchenne modified Eagle medium (DMEM) containing 4500 mg / L glucose, penicillin-streptomycin solution (100 U / ml each, purchased from Thermo Fisher Scientific), 10% (v / v) fetal bovine serum, and 0.584 g / L glutamine. The cells were then placed in 12-well dishes and cultured until confluence. After passage 8, the cells were used for experiments, yielding cultured HDF cells. Before use, the cells were washed twice with PBS to obtain cells containing 2 × 10⁶ cells / ml. 5 Cell culture medium for HDF cells / pores.

[0062] (2) 14 Preparation of C-labeled ascorbic acid stock solution: 1.85 MBq of... 14 C was dissolved in 77 μL of transfer buffer (140 mM NaCl, 4.2 mM KHCO3, 5.8 mM KCl, 1.3 mM CaCl2, 0.5 mM MgCl2, 10 mM Hepes, 1 wt% penicillin-streptomycin solution, 0.1 mM DTT), and then ascorbic acid was added to obtain... 14 The stock solution of C-labeled ascorbic acid, wherein the concentration of ascorbic acid in the stock solution is 50 mM.

[0063] (3) Preparation of test samples: The test solution for the sample group consisted of a skin-brightening composition containing 250 μg / mL of water and 100 μM of sodium chloride solution. 14 Cell culture medium containing C-labeled ascorbic acid stock solution; the test solution for the blank group contained 100 μM. 14 C-labeled ascorbic acid stock solution and cell culture medium.

[0064] (4) VC absorption test: The test solutions of the sample group and the blank group were incubated at 37℃ for 60 min. Immediately after incubation, the cells were lysed on ice to obtain lysate. The lysate was centrifuged, and the supernatant was frozen, washed twice with ice-cold PBS, and finally stored in urea buffer. The amount of radiolabeled material in the supernatant was quantified using a liquid scintillation counter method; the greater the amount of radiolabeled material, the greater the VC absorption. The formula for calculating the VC absorption enhancement rate is as follows:

[0065] VC absorption enhancement rate = |Amount of radiomarker in sample group - Amount of radiomarker in blank group| / Amount of radiomarker in blank group × 100%. Data are shown in Table 1.

[0066] Table 1. Data on the VC absorption enhancement rate of each group of samples.

[0067] Group Vitamin C absorption enhancement rate / % Example 1 45.39 Example 2 44.38 Example 3 44.47 Example 4 42.25 Example 5 42.53 Example 6 38.42 Example 7 38.16 Comparative Example 1 15.27 Comparative Example 2 16.60 Comparative Example 3 17.39 Comparative Example 4 18.89

[0068] This test directly verifies that the composition promotes the rate of vitamin C absorption by dermal cells by detecting the amount of radioactive markers in dermal cells.

[0069] As shown in Table 1, the data from Example 1 and Comparative Examples 1-4 indicate that the composition of Example 1, which uses four ingredients—Camellia chrysantha flower extract, Elm arvensis bark extract, oat kernel protein, and Suizenji nori polysaccharide—significantly improves the absorption rate of Vitamin C compared to the compositions of Comparative Examples 1-4. This suggests that the four ingredients have a synergistic effect, which promotes the rate of Vitamin C absorption by dermal cells, enhances Vitamin C transport efficiency, and thus prolongs the skin brightening effect.

[0070] Based on the data from Examples 1-7, it can be seen that when the weight ratio of Camellia chrysantha flower extract, Elm bark extract, oat kernel protein, and Laver polysaccharide is (1-5):(1-3):(0.1-0.3):(0.01-0.03), the composition is more effective in promoting the absorption of vitamin C by dermal cells.

[0071] Application Example 1-7 and Comparative Application Example 1-4

[0072] The compositions of Examples 1-7 and Comparative Examples 1-4 were added to the serum at a concentration of 1 wt% to obtain the serums of Application Examples 1-7 and Comparative Application Examples 1-4. The formulations are shown in Table 2.

[0073] The preparation methods of the serums used in Application Examples 1-7 and Comparative Application Examples 1-4 include the following steps:

[0074] The preparation method of the serum includes the following steps:

[0075] S1. Mix the humectant, thickener and 1 / 2 volume of deionized water, homogenize at 80°C, then add the preservative and stir until homogeneous to obtain the mixture.

[0076] S2. When the temperature of the mixture in S1 drops to 40°C, add the components of the skin brightening composition, fragrance and remaining deionized water, stir well, and finally add pH adjuster to adjust pH to 6 to obtain the essence.

[0077] Table 2. Serum formulations for Application Examples 1-7 and Comparative Application Examples 1-4.

[0078]

[0079] Comparative Application Example 5

[0080] In contrast, the serum in Application Example 5 did not contain the skin-brightening composition, but instead used an equal amount of deionized water instead of the composition. The preparation method was the same as in Application Example 1.

[0081] Test Example 2: Serum Efficacy Test

[0082] This test case verifies the effects of the serums used in Examples 1-7 and the control examples 1-5 on soothing and brightening the skin. The experimental data are shown in Table 3.

[0083] According to the "Cosmetic Safety Technical Specifications" (2015), 60 volunteers aged 18-45 with dry, sensitive skin (lactate stinging score >3, skin moisture content 20 C.U-50 C.U) were selected for the experiment and randomly divided into 12 groups of 5 people each. Under normal circumstances, the volunteers applied the product to their entire face, taking an appropriate amount of lotion and massaging it in until absorbed. The volunteers were placed in an air-conditioned room at a temperature of 21±1℃ and humidity of 50±10%. The improvement of facial indicators was quantified and photographed using instruments. The test time was before use, 1 day after use, and 14 days after use. Skin brightness was measured using the Skin-Glossymeter GL 200 skin analyzer; transepidermal water loss (TEWL) value was measured using the Tewameter™ Hex transepidermal water loss and evaporative heat loss test probe; and skin redness was measured using the Skin-Colorimeter CL400 skin color difference test probe and Visia 7 (IPP).

[0084] The calculation formula is as follows:

[0085] TEWL value improvement rate = (TEWL value) 使用后 -TEWL value 使用前 ) / TEWL value 使用前 ×100%;

[0086] Brightness improvement rate = (brightness) 使用后 -brightness 使用前 Brightness before use ×100%;

[0087] Redness improvement rate = (Redness) 使用前 -Redness 使用后 Redness level before use × 100%.

[0088] The calculation results are shown in Table 3.

[0089] Table 3. Human efficacy test data for each group of serum samples.

[0090]

[0091]

[0092] The application examples show that the soothing effect on facial redness is represented by the redness improvement rate, the repair effect on barrier damage is represented by the TEWL value improvement rate, and the skin tone brightening effect is represented by the brightness improvement rate.

[0093] Depend on Figure 1-4 It can be seen that after 14 days of use, the facial redness and brightening effect of the serum in Application Example 1 were significantly improved compared with those in Comparative Application Example 5, indicating that the serum containing the skin brightening composition has a good effect on soothing redness and brightening skin tone.

[0094] As shown in Table 3, the data from Application Example 1 and Comparative Application Examples 1-4 indicate that the composition of Example 1, which uses four ingredients—Camellia chrysantha flower extract, Elm bark extract, oat kernel protein, and Suizenji nori polysaccharide—significantly improves the soothing effect on facial redness and the brightening effect on skin tone compared to the compositions of Comparative Examples 1-4. This demonstrates that these four ingredients can work synergistically to achieve long-lasting brightening, barrier repair, and soothing effects on irritation.

[0095] Based on the data from Application Examples 1-7, it can be seen that when the weight ratio of Camellia chrysantha flower extract, Elm bark extract, oat kernel protein, and Laver polysaccharide is (1-5):(1-3):(0.1-0.3):(0.01-0.03), the composition has better barrier repair, soothing, and skin brightening effects.

[0096] In summary, the skin-brightening composition of the present invention utilizes four components—Camellia chrysantha flower extract, Elm bark extract, oat kernel protein, and Suizenji nori polysaccharide—to synergistically promote the rate of VC absorption by dermal cells, enhance VC transport efficiency, and prolong the skin-brightening effect. Simultaneously, it can endogenously promote dermal cell vitality, thereby repairing the skin barrier and soothing irritation.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A skin-brightening composition containing Camellia chrysantha flower extract, characterized in that, It is composed of the following components: Camellia chrysantha flower extract, Elm sclerophylla bark extract, oat kernel protein and Suizenji nori polysaccharide, wherein the weight ratio of Camellia chrysantha flower extract, Elm sclerophylla bark extract, oat kernel protein and Suizenji nori polysaccharide is (1-10):(1-8):(0.1-1):(0.01-0.1).

2. The skin-brightening composition containing Camellia japonica flower extract as described in claim 1, characterized in that, The weight ratio of the Camellia chrysantha flower extract, the bark extract of Ulmus parvifolia, oat kernel protein and Porphyra yezoensis polysaccharide is (1-8):(1-5):(0.1-0.5):(0.01-0.05).

3. The skin-brightening composition containing Camellia japonica flower extract as described in claim 1, characterized in that, The weight ratio of the Camellia chrysantha flower extract, the bark extract of Ulmus parvifolia, oat kernel protein and Porphyra yezoensis polysaccharide is (1-5):(1-3):(0.1-0.3):(0.01-0.03).

4. The use of the skin-brightening composition containing Camellia japonica flower extract according to any one of claims 1-3 in the preparation of cosmetics suitable for dry and sensitive skin, characterized in that, The cosmetic is an essence, and the amount of the composition added is 3% of the total weight of the cosmetic.

5. An essence, characterized in that, The ingredients comprise the following ingredients by weight percentage: 1%-3% of the skin brightening composition according to any one of claims 1-3, 0.05%-0.5% of a thickener, 3%-20% of a moisturizer, 0.2%-5% of a preservative, 0.05%-0.1% of a pH adjuster, and 0.01%-1% of a fragrance, with the balance being deionized water.

6. The essence as described in claim 5, characterized in that, The raw material is selected from at least one of (a)-(d): (a) The thickener includes at least one of xanthan gum, carbomer 940, AVC, and high molecular weight cellulose; (b) The moisturizer includes at least one of allantoin, sodium polyacrylate, hydrogenated lecithin, betaine, β-glucan, trehalose, caprylyl glycol, dipropylene glycol, sodium hyaluronate, 1,2-butanediol, glycerin, budding stalk polysaccharide, and ceramide. (c) The pH adjuster includes arginine and / or sodium hydroxide; (d) The preservative includes at least one of 1,2-propanediol, 1,2-hexanediol and p-hydroxyacetophenone.

7. The method for preparing the essence according to claim 5, characterized in that, Includes the following steps: S1. Mix the humectant, thickener and part of the deionized water, homogenize at 75-85℃, then add the preservative and stir evenly to obtain the mixture. S2. When the temperature of the mixture in S1 drops to 35-45℃, add the components of the skin brightening composition, fragrance and remaining deionized water, stir well, and finally add pH adjuster to adjust the pH to obtain the essence.

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