CN115804744B - Essence capable of reducing skin itch and erythema - Google Patents
Essence capable of reducing skin itch and erythema Download PDFInfo
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- CN115804744B CN115804744B CN202211682518.9A CN202211682518A CN115804744B CN 115804744 B CN115804744 B CN 115804744B CN 202211682518 A CN202211682518 A CN 202211682518A CN 115804744 B CN115804744 B CN 115804744B
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- essence
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- skin
- reducing skin
- erythema
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- 206010015150 Erythema Diseases 0.000 title claims abstract description 41
- 230000001603 reducing effect Effects 0.000 title claims abstract description 37
- 208000003251 Pruritus Diseases 0.000 title claims abstract description 31
- 231100000321 erythema Toxicity 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000007803 itching Effects 0.000 claims abstract description 16
- 235000020334 white tea Nutrition 0.000 claims abstract description 16
- 235000019864 coconut oil Nutrition 0.000 claims abstract description 12
- 239000003240 coconut oil Substances 0.000 claims abstract description 12
- KZRXPHCVIMWWDS-AWEZNQCLSA-N (4S)-4-amino-5-dodecanoyloxy-5-oxopentanoic acid Chemical compound CCCCCCCCCCCC(=O)OC(=O)[C@@H](N)CCC(O)=O KZRXPHCVIMWWDS-AWEZNQCLSA-N 0.000 claims abstract description 11
- LEACJMVNYZDSKR-UHFFFAOYSA-N 2-octyldodecan-1-ol Chemical compound CCCCCCCCCCC(CO)CCCCCCCC LEACJMVNYZDSKR-UHFFFAOYSA-N 0.000 claims abstract description 11
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- 229940071085 lauroyl glutamate Drugs 0.000 claims abstract description 11
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Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
Landscapes
- Cosmetics (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
The invention discloses an essence for reducing skin itch and erythema, which comprises the following components in percentage by weight: 1-10wt% of golden flower white tea extract; 0.25-1.25wt% of Quercus salicina bark extract; 0.7-3.5wt% of coconut oil; 3-10wt% of the lagoon water; 0.2-2wt% of phytosterol/octyl dodecanol lauroyl glutamate. The invention adopts the specific content of the extract of the golden flower white tea, the extract of the European cork oak bark, the coconut oil, the water of the lakeflow of the cress, the phytosterol/octyl dodecanol lauroyl glutamate, and the mutual interaction of the components is synergistic, so that the prepared essence has excellent effects of relieving itching, repairing and reducing skin redness; and each component is irreplaceable, and the addition range of each component is an optimal range, and is an optimal range in the aspects of relieving itching, repairing and reducing skin redness and cost.
Description
Technical Field
The invention relates to the field of cosmetics, in particular to an essence capable of reducing skin itch and erythema.
Background
According to the unaware degree of skin sensitivity, sensitive muscle groups can be classified into weak/light/medium/heavy sensitivity, and 67.7% of sensitive muscle female skin sensitivity in China is in weak degree or light degree at present, and is expressed as itching/stinging/reddening; whereas 32.4% of sensitive myofemales are moderately or severely sensitive, sensitive manifestations such as redness/inflammation have occurred. Major influencing factors that lead to an increasing incidence of skin sensitivity include: 1) External environment: is influenced by external factors such as seasonal variation, living habit, stay up and overtime, etc.; 2) Medical injury: skin barriers are damaged in a short period after medical treatment, and sensitive phenomenon is easy to cause; 3) Wearing a mask: the long-term wearing of the mask can cause skin closure, and is easy to cause sensitivity, closure and acne. The problem of sensitive muscles exceeding seven kinds of skin can be improved through daily maintenance and skin care, nearly five kinds of people with sensitive skin are mildly sensitive, stabbing pain, reddening and itching are main symptoms of people with mild sensitivity, and as the incidence rate of skin sensitivity is continuously improved, the nursing consciousness of consumers is improved, so that high discussion is caused. The market demand is specially aimed at products for reducing the initial itching and reddening of skin, and solves the problem of skin of consumers in a mild sensitive period.
However, the anti-allergic and soothing essence with better sales volume is declared on the market at present, and the anti-inflammatory and anti-allergic component dipotassium glycyrrhizinate or the repairing component ceramide contained in the anti-allergic and soothing essence cannot achieve the effects of better repairing skin barrier, reducing skin moisture loss, reducing skin erythema and reducing pruritus.
Disclosure of Invention
In view of the above, the primary objective of the present invention is to provide an essence for reducing skin itching and erythema.
The technical problems of the invention are solved by the following technical scheme:
an essence for reducing skin itch and erythema comprises the following components in percentage by weight:
1-10wt% of golden flower white tea extract;
0.25-1.25wt% of Quercus salicina bark extract;
0.7-3.5wt% of coconut oil;
3-10wt% of the water of the lake of the Indian river;
0.2-2wt% of phytosterol/octyl dodecanol lauroyl glutamate.
In some embodiments of the present invention, the essence for reducing skin itch and erythema comprises the following components in percentage by weight:
4-6wt% of golden flower white tea extract;
0.5-1wt% of Quercus salicina bark extract;
1-3wt% of coconut oil;
6-8wt% of the lagoon water;
0.5-1.5wt% of phytosterol/octyl dodecanol lauroyl glutamate.
In some embodiments of the invention, the essence for reducing skin itch and erythema further comprises the following components:
1-5wt% of pentanediol;
0.5-3wt% of hexanediol;
0.05-0.2wt% of EDTA disodium;
0.05-1wt% of small nuclear fungus glue;
0.2-2wt% of cetostearyl alcohol olive oleate;
2-5wt% of propyl heptyl octanoate;
0.5-3wt% of cyclopentadimethicone;
glycerol 1-5wt%.
In some embodiments of the present invention, the active components of the extract of the golden camellia white tea are flavone and polysaccharide, and the content range is more than 0.7%. The ancient people had more accurate knowledge of the most basic medicinal value of white tea, and considered that white tea is cool in nature and can dispel heat, reduce pathogenic fire, dispel summer-heat and detoxify. Clear Zhou Lianggong is written in Min's diary: it is a holy medicine for treating measles, its action is cold and the same as that of Rhinoceros horn. The golden flower white tea is prepared by finely selecting the raw materials of the aged white tea, introducing golden flowers into the traditional production process of the white tea and adopting a natural flower-growing process. The golden flower is also called golden flower fungus, the academic name is "Guanyu bursa fungus", belongs to probiotics, is a national secondary protection confidential strain, contains 450 kinds of beneficial components for human body, can effectively inhibit the growth of other harmful bacteria, and is a natural probiotic grown in tea leaves through an innovative flowering process under a specific temperature and humidity condition. Has antioxidant and antibacterial effects. The extract of the golden flower white tea has the effects of inhibiting the transcription expression and secretion of macrophage inflammatory factors, inhibiting the aggregation of neutrophils, reducing excessive skin sensitivity, improving skin tolerance threshold, resisting inflammation and the like; also has effects of promoting healing and repairing injured tissue.
In some embodiments of the invention, the effective component of the Quercus salicina bark extract is a triterpene compound, such as beta-sitosterol, friedelane, betulin, etc., and the content is more than 50%. The spanish cork oak (the source of wood plug is the main component of wood plug) is a botanical name, named a slow-growing, evergreen oak tree that grows in the Mediterranean region, typically over 130-200 years. The Quercus suber bark extract is prepared from Quercus suber through a series of treatment modes, supercritical carbon dioxide extraction and 100% ecological technology, is rich in anti-inflammatory molecules, beta-sitosterol, wood-embolism alkane, betulinol and the like, and has the effects of resisting free radicals, reducing secretion of cell inflammatory factor TNF-alpha, preventing skin erythema and increasing collagen content in skin.
In some embodiments of the invention, the lagoon water is rich in minerals and trace elements, has total mineral content of 2.5-3.5%, contains 1015mg/L sulfur, magnesium > 1000ppm, potassium > 220ppm, sodium > 7500ppm, and calcium > 215mg/L, and has effects of refreshing, purifying, and relaxing skin, and can also relieve skin congestion symptoms.
In some embodiments of the invention, the structure of the phytosterol/octyl dodecanol lauroyl glutamate is similar to intercellular lipid, so that the intercellular lipid can be supplemented, an effect superior to that of ceramide is achieved, the particle size of the phytosterol/octyl dodecanol lauroyl glutamate reaches 50-200nm by using a high-pressure emulsification mode, the efficiency of the product is greatly improved, and the product is convenient to use in a water agent.
In some embodiments of the invention, the coconut oil is cocoa, a green industrially produced medium chain length triglyceride, that is highly resistant to skin, and is highly absorbable on skin, while promoting absorption and penetration of cork oak bark extract on skin, by a pre-press cold press process. The chain length of the coconut oil is C6-C12, and the melting point is 26-32 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1) The invention adopts the specific content of the extract of the golden flower white tea, the extract of the European cork oak bark, the coconut oil, the water of the lakeflow of the cress, the phytosterol/octyl dodecanol lauroyl glutamate and the mutual interaction of the components to synergistically increase, so that the prepared essence has excellent effects of relieving itching, repairing and reducing skin redness and is a very excellent product for sensitive muscles.
2) The invention proves the effectiveness of the essence by a large number of experiments, each component has irreplaceability, and the addition range of each component in the essence is an optimal range, and is an optimal range in the aspects of relieving itching, repairing and reducing the skin redness and the cost. In conclusion, the essence provided by the invention is economical and effective and is capable of reducing skin itch and erythema.
Drawings
FIG. 1 is an arm section of a volunteer at the time of an experiment;
figure 2 is a 0 hour, 24 hours and 48 hour skin redness condition of volunteers after use of example 2 of the present invention;
figure 3 is a 0 hour, 24 hours, and 48 hours skin redness condition of volunteers after use of example 1 of the present invention;
fig. 4 shows the redness of the skin of volunteers 0 hours, 24 hours and 48 hours after application of example 3 according to the present invention.
Detailed Description
The invention is further illustrated in detail below in connection with specific examples which are provided solely for the purpose of illustration and are not intended to limit the scope of the invention. The test methods used in the following examples are conventional methods unless otherwise specified; the materials, reagents and the like used, unless otherwise specified, are those commercially available.
The extract of Camellia sinensis is purchased from International pharmaceutical health Co., ltd;
quercus salicina bark extract, purchased from HALLSTAR BEAUTY AND PERSONAL CARE SOLUTIONS COMPANY;
coconut oil, purchased from HALLSTAR BEAUTY AND PERSONAL CARE SOLUTIONS COMPANY;
the water from the lakewater, which is purchased from the company, the trade limited, of the company, guangzhou;
phytosterol/octyldodecanol lauroyl glutamate, purchased from AJINOMOTO co., inc.
Examples 1-3 and comparative examples 1-9: preparation of essence capable of reducing skin itching and erythema
The essence for reducing skin itch and erythema is obtained according to the proportion and operation steps shown in table 1, and is specifically shown in table 1.
TABLE 1
Description:
1. comparative example 1 is an essence obtained by replacing the extract of the golden flower white tea in the essence of example 1 of the present invention with dipotassium glycyrrhizinate which is an anti-inflammatory and anti-allergic component commonly used in the industry;
2. comparative example 2 is an essence obtained by replacing the extract of Quercus salicina bark and coconut oil in the essence of example 1 of the present invention with dipotassium glycyrrhizinate, an anti-inflammatory and anti-allergic ingredient commonly used in the industry;
3. comparative example 3 is an essence obtained by replacing phytosterol/octyldodecanol lauroyl glutamate and lagoon water in the essence of example 1 of the present invention with ceramide, a repairing component commonly used in the industry;
4. comparative examples 4 to 8 are essences obtained by adding only one of the active ingredients of the present invention in an amount up to the maximum;
5. comparative example 9 is an essence obtained by adding each of the active ingredients of the present invention in an amount higher than the highest concentration of the present invention;
6. comparative example 10 is a commercially available anti-allergy soothing serum with a good sales volume.
Verification of the essence described in examples 1-3 and comparative examples 1-10 with reduced skin itching and erythema
1. Test instrument:
1. the invention uses a percutaneous moisture loss measuring instrument of Finland Delfin VapoMeter SWL5201, and the VapoMeter uses a closed cavity measuring principle, so that the measurement is not influenced by indoor air flow. The measurement time is short, ensuring the minimization of blocking normal evaporation.
2. Using finnish Delfin antra 3D photographs, antra 3D uses innovative optical methods and complex mathematical algorithms to acquire three-dimensional images. This way, data can be extracted from images relating to the three-dimensional shape of the skin, which will enable quantification of the treatment effect and monitoring of the condition over time. For example, the texture, smoothness, and depth and width of fine lines and wrinkles of the skin are measured. With its multispectral analysis, the antra software can also measure pigmentation and redness, which will provide meaningful information about sun damage, veins, etc.
2. Experimental principle:
TEWL values, transdermal water loss (Transepidermal water loss, TEWL) measures the change in vapor pressure of moisture adjacent to the skin surface. TEWL value indicates the loss of water from the stratum corneum, and is an important criterion for evaluating barrier function of the stratum corneum. The lower the TEWL value of the skin, the better the barrier function of the skin, and vice versa. The efficacy of the moisturizing and repairing cosmetic can be evaluated by testing the value of the TEWL of the skin moisture loss, and the moisturizing and repairing cosmetic can also be applied to the monitoring of allergic patch tests, contact dermatitis, physiotherapy, burn and new tissues, and whether the protection function of the skin is destroyed can be found in time. Wherein, the unit of TEWL is: g/hm 3 。
3. Test population:
40 persons in each group, 3 groups of volunteers aged 18-60 years to meet the experimental requirements.
4. Test conditions:
the subjects were rested for 30 minutes at room temperature of 20.+ -. 2 ℃ and relative humidity of 50.+ -. 10% and were monitored dynamically in real time and the relevant data was retested.
5. The experimental process comprises the following steps:
1. establishment of damaged skin barrier condition
200 mu L + -10 mu L of sodium dodecyl sulfate solution 1% (w/w) is injected into the small chamber of the patch tester, the filter paper sheet is soaked, the filter paper sheet is adhered to the curved sides of the left and right forearms of a subject by using hyposensitization tapes, the distance between the edges of the small chamber of the adjacent patch tester is not less than 3cm, and the filter paper sheet is uniformly adhered to the skin by using palm light pressure for 24 hours.
After removing the plaque tester, the test person sits still for 30min in a test environment which accords with the standard (after the indentation disappears), the test person measures the TEWL value for the center position of each plaque test area of the test person by using a Delfin vapoMeter (skin water shunt loss instrument), each area is measured once, and the measurement result is expressed by the average value of the TEWL values of three plaque test areas and is taken as an initial value (TEWL 0); photographing each plaque area of the subject by using a Delfin Antera3D camera, analyzing by using an instrument, and setting a measurement result to RED0 by taking the measurement average value of the three plaque areas as a redness initial value;
the left arm and the right arm are smeared with samples randomly, so that the equilibrium is ensured to be reached statistically;
the sample is dispensed to the subject and the subject is allowed to smear according to instructions, the smear of the sample being required to completely cover the entire plaque area. Measuring the sample using amount by an analytical balance, and using for 48 hours;
before each test, cleaning the tested part with clear water, sucking the tested part with a chipless water-absorbing dry paper towel, and resting for 30min under a constant temperature and humidity environment (the temperature is 20-22 ℃ and the relative humidity is 40-60%), so that the tested part cannot drink water and beverages, and the tested part keeps relaxed to avoid touching the patch area;
the test subject is subjected to a return visit at 24h and 48h after using the sample according to the use requirement, the volunteer fills out a questionnaire, the skin condition of the tested area of the volunteer is recorded, the test subject enters a test room to rest 30 minutes in advance, and the test step of T0 is repeated;
test part: experiments were performed with arm sections as shown in FIG. 1
The first set of zones Z1 used example 1, zone Z2 used comparative example 3, zone Z3 used comparative example 1, zone Z4 used comparative example 2, zone Z5 was blank;
the second set of zones Z1 used example 1, zone Z2 used example 3, zone Z3 used comparative example 10, zone Z4 used example 2, zone Z5 was blank, zone Z6 used comparative example 9;
the third group of zones Z1 used example 1, zone Z2 used comparative example 5, zone Z3 used comparative example 7, zone Z4 used comparative example 4, zone Z5 used comparative example 6, zone Z6 used comparative example 8.
6. Experimental results:
1. skin Transcutaneous Water loss (TEWL) test
The test sets TEWL at day 0 as TEWL0 measured in the subject, TEWL as TEWL1 after 24 hours, TEWL as TEWL2 after 48 hours, TEWL change values as Δtewl, Δtewl=tewl2-TEWL 0, TEWL change rate = Δtewl/tewl0 x 100%, TEWL change rate is negative, and the lower the value, the less moisture loss of skin after 48 hours, i.e. the better the skin barrier function is repaired, the healthier the skin is, table 1 shows the average Δtewl values for each group, as shown in table 2 below:
TABLE 2
2. Pi Fufan Red average result analysis
The average RED value RED of the skin on day 0 measured by a subject is set as RED0, RED is set as RED1 after 24 hours, RED is set as RED2 after 48 hours, RED change value is Δred, Δred=red 2-RED 0, RED change rate= Δred/RED0 is 100%, RED change rate is negative, and the lower the value is, the smaller the RED degree of the skin after 48 hours is, namely, the less inflammatory reaction in the skin is, the allergic symptoms are reduced, and the better the effects of relieving allergy and reducing erythema of the product are. Table 2 shows the average Δred values for each group, as shown in table 3 below;
TABLE 3 Table 3
3. Volunteer questionnaire
According to volunteer questionnaire statistics, 100% of volunteers using the examples considered the product to have reduced itching, tingling, and no subjective intention to scratch the area under test; the use of the volunteers of the comparative example was 50% of the volunteers considered to reduce itching, tingling, and 50% of the volunteers had the sensation of wanting to scratch the test area.
Experimental results illustrate:
from the above experimental findings, it can be seen that:
the first group of results, TEWL change rate and RED change rate, comparative examples 1-3> example 1, demonstrate that the effects of better repairing skin barrier, reducing skin moisture loss, reducing skin erythema and reducing itching feeling can not be achieved by arbitrarily changing the active ingredients in the essence of the invention into the commonly used ingredients with good anti-allergy and repairing effects.
The second set of results, TEWL rate of change and RED rate of change, comparative example 10> example 1> comparative example 9> example 2> example 3, show that the higher the amount of active ingredient added in the essence of the present invention, the smaller the TEWL and RED rate of change, i.e., the less the skin moisture loss, the less the reddish skin symptoms, the more complete the barrier function of the stratum corneum of the skin, the less the skin moisture loss, and the better the skin erythema reducing effect. In comparative example 9, the active ingredients of the essence of the invention are further improved, but the experimental results prove that the content of each ingredient is blindly improved, and the skin barrier can not be better repaired, and the skin redness symptom is relieved, so that the content interval of the essence of the invention is the interval with the best effect. The essence of comparative example 10 is inferior to the essence of the present invention in repairing skin barrier and reducing redness, so that it is shown that the essence of the present invention is a very excellent product for reducing skin sensitive symptoms and reducing skin redness and itching.
The third group of results, TEWL change rate and RED change rate, comparative examples 4-8> example 1, show that the effects of repairing skin barrier, reducing erythema and reducing skin itching feeling are not as good as those of the essence of the invention when only a certain active ingredient in the essence of the invention is added and the instant addition amount reaches the maximum value.
Comparison of test pictures
The front-back comparison of the arm redness images of a part of volunteers using the examples 1-3 of the present invention is shown in fig. 2-4, respectively, and it can be intuitively seen from the figures that the skin redness reduction is obvious by using the examples 1 and 2 as shown in fig. 2 and 3, and the skin redness reduction is most obvious by using the example 3 as shown in fig. 3, which indicates that the skin redness reduction capability of the essence of the present invention is very excellent.
Claims (6)
1. The essence for reducing skin itch and erythema is characterized by comprising the following components in percentage by weight:
1-10wt% of golden flower white tea extract;
0.25-1.25wt% of Quercus salicina bark extract;
0.7-3.5wt% of coconut oil;
3-10wt% of the water of the lake of the Indian river;
0.2-2wt% of phytosterol/octyl dodecanol lauroyl glutamate;
1-5wt% of pentanediol;
0.5-3wt% of hexanediol;
0.05-0.2wt% of EDTA disodium;
0.05-1wt% of small nuclear fungus glue;
0.2-2wt% of cetostearyl alcohol olive oleate;
2-5wt% of propyl heptyl octanoate;
0.5-3wt% of cyclopentadimethicone;
glycerol 1-5wt%.
2. The essence for reducing skin itch and erythema according to claim 1, comprising the following components in weight percent:
4-6wt% of golden flower white tea extract;
0.5-1wt% of Quercus salicina bark extract;
1-3wt% of coconut oil;
6-8wt% of the lagoon water;
0.5-1.5wt% of phytosterol/octyl dodecanol lauroyl glutamate;
1-5wt% of pentanediol;
0.5-3wt% of hexanediol;
0.05-0.2wt% of EDTA disodium;
0.05-1wt% of small nuclear fungus glue;
0.2-2wt% of cetostearyl alcohol olive oleate;
2-5wt% of propyl heptyl octanoate;
0.5-3wt% of cyclopentadimethicone;
glycerol 1-5wt%.
3. The essence for reducing skin itch and erythema according to claim 1 or 2, wherein the active ingredients of the extract of the golden flower white tea are flavone and polysaccharide, and the content range is more than 0.7%.
4. The essence for reducing skin itch and erythema according to claim 1 or 2, wherein the effective component of the extract of the bark of the Quercus salicina is a triterpene compound with a content of more than 50%.
5. The essence for reducing skin itch and erythema according to claim 1 or 2, wherein the total mineral content of said water is 2.5-3.5%, sulfur is 1015mg/L, magnesium is > 1000ppm, potassium is > 220ppm, sodium is > 7500ppm, calcium is > 215mg/L.
6. The essence for reducing skin itching and erythema according to claim 1 or 2 wherein the coconut oil has a chain length of C6-C12 and a melting point of 26-32 ℃.
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| CN111529444A (en) * | 2020-05-25 | 2020-08-14 | 湖北省麦诗特生物科技有限公司 | Composition with skin barrier repair function and preparation method and application thereof |
| WO2021218039A1 (en) * | 2020-04-29 | 2021-11-04 | 上海林清轩生物科技有限公司 | Biomimetic and camellia extract-containing skin barrier repair composition and application thereof |
| CN115337239A (en) * | 2022-08-31 | 2022-11-15 | 广州研智化妆品有限公司 | Essential oil with relieving and repairing effects and preparation method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103202777A (en) * | 2012-01-17 | 2013-07-17 | 株式会社芳珂 | Emulsion cosmetic |
| CN107854367A (en) * | 2017-12-19 | 2018-03-30 | 广州源理生物科技有限公司 | A kind of Essence for sensitive skin reparation |
| WO2021218039A1 (en) * | 2020-04-29 | 2021-11-04 | 上海林清轩生物科技有限公司 | Biomimetic and camellia extract-containing skin barrier repair composition and application thereof |
| CN111529444A (en) * | 2020-05-25 | 2020-08-14 | 湖北省麦诗特生物科技有限公司 | Composition with skin barrier repair function and preparation method and application thereof |
| CN115337239A (en) * | 2022-08-31 | 2022-11-15 | 广州研智化妆品有限公司 | Essential oil with relieving and repairing effects and preparation method thereof |
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