A six-in-one essential oil for improving menopausal skin barrier problems and a preparation process thereof

Abstract

The present application belongs to the technical field of cosmetics, and discloses a six-fold essence oil for improving menopausal skin barrier problems and a preparation process thereof. The raw materials of the six-fold essence oil include white pool flower seed oil 38-41%, evening primrose oil 18-22%, egg yolk oil 13-17%, sea buckthorn fruit oil 13-17%, Inca fruit seed oil 4-6%, borage seed oil 4-6%, and tocopherol acetate 0.3-0.7%. The preparation process includes six steps of raw material pretreatment, basic oil dispersion, step-by-step compounding and mixing, antioxidant component addition, gradient filtration and refining, and vacuum degassing and discharging, solves the problems of poor compatibility and easy stratification of traditional oil mixing, and improves the product stability and active ingredient absorption efficiency. The raw materials of the present application are natural and mild, the formula is scientific, and each component synergistically realizes the effects of lipid supplementation, barrier repair, antioxidant and anti-inflammatory, can efficiently improve the problems of menopausal skin dryness, roughness, sensitivity and the like, and has a good application prospect in the field of menopausal skin care cosmetics.

Description

Technical Field

[0001] This invention belongs to the field of cosmetic technology, specifically relating to a six-fold essential oil for improving menopausal skin barrier problems and its preparation process. Background Technology

[0002] Menopausal women experience a sharp drop in estrogen levels, leading to decreased sebum secretion, severe loss of lipids in the stratum corneum, and damage to the skin barrier structure. This results in problems such as dryness, roughness, itching, increased fine lines, and sensitivity / redness. These skin issues are characterized by a long repair cycle and limited effectiveness of conventional skincare products. Currently available facial oil products for menopausal skin often use simple oil-blending processes with limited ingredients, typically containing only one or two plant oils. These fail to meet the comprehensive needs of menopausal skin for multiple lipids, antioxidants, and soothing components, providing only basic hydration without addressing the root cause of the damaged skin barrier. Furthermore, improper formulation ratios and imbalances in ingredients not only fail to create synergistic effects but can also lead to antagonistic interactions, resulting in poor barrier repair, a heavy feel, or irritation to sensitive skin. Finally, some products contain excessive chemical additives, which are incompatible with the sensitive and fragile skin of menopausal women, easily triggering adverse reactions such as allergies and stinging.

[0003] The few existing compound oil-based essential oils do not target the core mechanisms of menopausal skin barrier damage by selecting suitable functional oils, nor do they utilize scientific formulation to achieve synergistic effects among the ingredients, resulting in products with weak targeting and limited repair effects. Furthermore, most plant-based oil-based essential oils on the market are prepared by direct mixing at room temperature, lacking targeted raw material pretreatment and step-by-step dispersion processes. This leads to poor compatibility of the oil system, making it prone to separation and rancidity during storage, while also preventing the active ingredients from fully exerting their skincare efficacy. Therefore, developing a skincare product that precisely meets the needs of menopausal skin and effectively repairs the skin barrier has become a major expectation for people going through menopause. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of menopausal skin care, such as lack of specificity, limited barrier repair effects, poor skin feel, and easy irritation to sensitive skin. It provides a six-fold essential oil and its preparation process to improve menopausal skin barrier problems. It is made by screening natural oil components that are suitable for the skin barrier repair needs of menopausal women and scientifically compounding them. It is suitable for the sensitive and fragile skin condition of menopausal women and solves barrier-related problems such as dry skin, roughness, sensitivity, and fine lines in menopausal women.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A six-ingredient essential oil for improving menopausal skin barrier problems, comprising the following ingredients by weight percentage: meadowfoam seed oil 38-41%, evening primrose oil 18-22%, egg yolk oil 13-17%, sea buckthorn fruit oil 13-17%, Sacha Inca seed oil 4-6%, borage seed oil 4-6%, and tocopheryl acetate 0.3-0.7%.

[0006] This invention utilizes six essential oil ingredients that work synergistically and complementarily to form a comprehensive, multi-dimensional skin barrier repair system. Among them, meadowfoam seed oil, as the core base oil, possesses excellent antioxidant and film-forming properties, forming a breathable protective film on the skin surface to reduce lipid and moisture loss, providing a stable environment for barrier repair, and replenishing the stratum corneum's basic lipids; evening primrose oil is rich in... Linolenic acid can directly replenish key lipids lost during menopause, regulate skin lipid metabolism, repair the stratum corneum structure, enhance water retention, and relieve sensitivity and itching; egg yolk oil contains natural lipids such as lecithin and cholesterol, which are similar in structure to the sebum membrane and have strong affinity, deeply moisturizing, promoting barrier cell regeneration and repair, and improving dry and rough skin; sea buckthorn fruit oil is rich in vitamins and flavonoid antioxidants, which can eliminate free radicals, reduce barrier cell damage, and exert anti-inflammatory and soothing effects, improving discomfort such as redness and stinging; Inca Inchi seed oil contains a balanced ratio of... Unsaturated fatty acids can further replenish lipids in the stratum corneum, enhance moisture retention and elasticity, and promote the penetration and absorption of other ingredients; borage seed oil is also rich in these nutrients. Linolenic acid, in synergy with evening primrose oil, enhances the repair effect of the stratum corneum and helps soothe skin sensitivity; tocopheryl acetate, as a natural antioxidant, can inhibit the oxidation and rancidity of various oils and improve product stability, and can also form a dual antioxidant system with sea buckthorn fruit oil to protect skin barrier cells.

[0007] This invention achieves synergistic effects among its components through scientific formulation, constructing a complete system of "basic protection - lipid replenishment - barrier repair - antioxidant soothing": evening primrose oil and borage seed oil synergistically supplement... Linolenic acid, egg yolk oil, Sacha Inchi seed oil, and meadowfoam seed oil replenish corresponding lipids, with these five types of oils working synergistically to comprehensively repair the stratum corneum structure. Meadowfoam seed oil provides a protective environment, egg yolk oil promotes cell regeneration, evening primrose oil and borage seed oil repair the stratum corneum, and Sacha Inchi seed oil enhances penetration; the four work together to accelerate barrier repair. Sea buckthorn fruit oil and tocopheryl acetate provide dual antioxidant benefits, while sea buckthorn fruit oil, evening primrose oil, and borage seed oil work together to soothe and reduce inflammation, significantly improving the formula's gentleness. At the same time, meadowfoam seed oil regulates the skin feel, while Sacha Inchi seed oil and borage seed oil refine the molecular particle size, making the product moisturizing without being sticky, easily absorbed, and highly stable. The proportions of each ingredient are reasonable, with no antagonistic effects, and the overall synergistic effect is significantly better than single oils or conventional compound formulas.

[0008] Preferably, the raw material composition, by weight percentage, includes: 39.5% meadowfoam seed oil, 20% evening primrose oil, 15% egg yolk oil, 15% sea buckthorn fruit oil, 5% Inca Inchi seed oil, 5% borage seed oil, and 0.5% tocopheryl acetate.

[0009] This invention also provides a preparation process for the above-mentioned six-fold essential oil, comprising the following steps: S1. Raw material pretreatment: Meadowfoam seed oil, evening primrose oil, sea buckthorn fruit oil, Sacha Inca seed oil, and borage seed oil are vacuum filtered through microporous membranes to remove impurities. Egg yolk oil is melted in a constant temperature water bath and then filtered to remove impurities for later use. S2. Basic oil dispersion: Pretreated meadowfoam seed oil, evening primrose oil and sea buckthorn fruit oil are added to the reactor and pre-stirred to form the basic oil phase; S3. Stepwise compounding: Add egg yolk oil, Inca Inchi seed oil and borage seed oil to the base oil phase in sequence, and stir stepwise to form a compound oil phase; S4. Addition of antioxidant components: Slowly add tocopheryl acetate to the complex oil phase, and stir to disperse after the addition is complete; S5, Gradient Filtration Refining: The mixed oil system is sequentially subjected to coarse filtration and fine filtration; S6. Degassing and Discharging: After vacuum degassing the filtered oil system, discharge it in the dark, seal and fill it to obtain the six-fold essential oil.

[0010] As a further description of the above technical solution: the pore size of the microporous filter membrane in step S1 is 0.22 μm, and the filter membrane material is PTFE (polytetrafluoroethylene) or PVDF (polyvinylidene fluoride).

[0011] As a further description of the above technical solution: the temperature of the constant temperature water bath for the egg yolk oil in step S1 is 35-45℃.

[0012] As a further description of the above technical solution: the dropping rate of tocopherol acetate in step S4 is 5-8 mL / min.

[0013] As a further description of the above technical solution: the coarse filtration in step S5 uses a 200-mesh filter screen, and the precision filtration uses a 0.22 μm microporous filter membrane.

[0014] As a further description of the above technical solution: the vacuum degree of vacuum degassing in step S6 is -0.08 to -0.10 MPa, and the degassing time is 3 to 5 minutes.

[0015] The present invention also provides the application of the above-mentioned six essential oils in the preparation of cosmetics for improving dry, rough, sensitive, red, and fine lines of menopausal women and repairing the skin barrier; the cosmetics are one or more of facial essential oils, body care oils, and neck care oils.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The formula uses a scientific blend of six natural functional oils and trace amounts of tocopheryl acetate. Each ingredient works synergistically in multiple dimensions, including lipid replenishment, barrier repair, anti-oxidation, anti-inflammation, and water retention. It can effectively repair the skin barrier damaged during menopause and significantly improve skin dryness, roughness, sensitivity, and fine lines. The raw materials are all natural plant oils and egg yolk oil, without the addition of fragrances, preservatives, pigments, mineral oils, or other chemical additives. After multiple filtrations to remove impurities, the product has high purity, is gentle and non-irritating, and has no adverse reactions such as redness, stinging, or allergies. It is suitable for long-term use on sensitive skin during menopause.

[0017] 2. The innovative process of raw material pretreatment, step-by-step constant temperature dispersion, gradient filtration, and vacuum degassing solves the problems of poor oil compatibility, easy stratification, and easy loss of active ingredients in traditional mixing processes. This makes the product system uniform and stable, with no stratification or rancidity after 6 months of storage. At the same time, the molecular particle size is finer and the absorption is faster. After use, the skin feels moisturized and non-sticky, and the skin care effect is obvious and clear. With the addition of antioxidant ingredients and vacuum degassing, the product can have a shelf life of more than 18 months under normal temperature, light-proof and sealed conditions. The entire process steps are clear, the parameters are well-defined, and the operation is controllable. No special high-end equipment is required, which is easy to scale up and standardize for industrial production. The production efficiency is high and it is environmentally friendly. Attached Figure Description

[0018] Figure 1 These are before-and-after photos of facial skin before and after using the six-fold essence oil from Example 1. Detailed Implementation

[0019] The claims of the present invention will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of protection of the claims of the present invention are still within the scope of protection of the claims of the present invention.

[0020] Example 1 This embodiment provides a six-ingredient essential oil for improving menopausal skin barrier problems. By weight percentage, the ingredients include: meadowfoam seed oil 39.5%, evening primrose oil 20%, egg yolk oil 15%, sea buckthorn fruit oil 15%, Sacha Inca seed oil 5%, borage seed oil 5%, and tocopheryl acetate 0.5%.

[0021] Its preparation process includes the following steps: S1. Raw material pretreatment: Meadowfoam seed oil, evening primrose oil, sea buckthorn fruit oil, Sacha Inca seed oil, and borage seed oil are vacuum filtered through a 0.22 μm PTFE microporous membrane to remove impurities and avoid affecting the synergistic effect of the formula; egg yolk oil is melted in a 42℃ constant temperature water bath and then filtered through a 100-mesh filter to remove solid impurities for later use. S2. Basic oil dispersion: Add the pretreated meadowfoam seed oil, evening primrose oil and sea buckthorn fruit oil to the reaction vessel, turn on the stirring device, and pre-stir for 6 minutes at a constant temperature of 28℃ to form a uniform basic oil phase, which lays the dispersion foundation for subsequent compounding of components. S3. Stepwise compounding: First, add the pretreated egg yolk oil to the above base oil phase and continue stirring for 4 minutes to fully integrate it with the base oil phase; then add the pretreated Inca Inchi seed oil and borage seed oil in sequence and continue stirring for 6 minutes to form a uniform and stable compound oil phase, ensuring that each oil component works synergistically. S4. Addition of antioxidant components: Tocopheryl acetate is slowly added dropwise to the composite oil phase at a rate of 6 mL / min. After the addition is complete, the mixture is stirred to ensure that the tocopheryl acetate is evenly dispersed in the system, so as to give full play to its antioxidant and formula stabilizing effects. S5. Gradient Filtration Refining: The mixed oil system is first coarsely filtered through a 200-mesh filter to remove a small amount of incompletely dispersed impurities; then it is precisely filtered through a 0.22 μm microporous membrane to further improve the purity of the product, avoid impurities from irritating the skin, and ensure the safety of product use. S6. Degassing and Discharging: Place the filtered oil system in a vacuum reactor and degas for 4 minutes under a vacuum of -0.09 MPa to remove air bubbles from the system and prevent accelerated oxidation during storage. After degassing, discharge the oil in the dark and seal it for filling to obtain the six-fold essence oil that improves menopausal skin barrier problems.

[0022] Example 2

[0023] A six-ingredient essential oil for improving menopausal skin barrier problems, with the following ingredients by weight percentage: meadowfoam seed oil 38%, evening primrose oil 22%, egg yolk oil 13%, sea buckthorn fruit oil 17%, Sacha Inca seed oil 4%, borage seed oil 6%, and tocopheryl acetate 0.3%.

[0024] Its preparation process is basically the same as that in Example 1.

[0025] Example 3

[0026] A six-ingredient essential oil for improving menopausal skin barrier problems, with the following ingredients by weight percentage: meadowfoam seed oil 41%, evening primrose oil 18%, egg yolk oil 17%, sea buckthorn fruit oil 13%, Sacha Inca seed oil 6%, borage seed oil 4%, and tocopheryl acetate 0.7%.

[0027] Its preparation process is basically the same as that in Example 1.

[0028] Comparative Example A skin care essential oil, by weight percentage, comprises: meadowfoam seed oil 64.5%, egg yolk oil 15%, sea buckthorn fruit oil 15%, and tocopheryl acetate 0.5% (excluding evening primrose oil, Sacha inchi seed oil, and borage seed oil).

[0029] Preparation process: The traditional direct mixing process is adopted. All raw materials are directly added to the reaction vessel and stirred at room temperature of 25°C for 12 minutes to make them evenly mixed. After filtration through a 200-mesh filter, the material is directly discharged.

[0030] Stability test: Test objective: To verify the system stability of the six-in-one essential oil under different storage conditions, to examine whether phenomena such as layering, precipitation, rancidity, and off-odors occur, and to evaluate the product's shelf life and storage suitability.

[0031] Test method: The samples of Examples 1-3 and the comparative examples were respectively placed into 20 mL transparent PET sealed cosmetic bottles (sample volume 15 mL). Three storage conditions were set: room temperature and protection from light (25±2℃, relative humidity 50±5%), high temperature acceleration (45±2℃, relative humidity 75±5%), and low temperature cycling (-5℃ for 12 h → 25℃ for 12 h, once a day). The appearance, state and odor of the samples were observed after 1 month, 3 months, 6 months and 12 months of storage. The presence of abnormalities such as layering, precipitation, turbidity, rancidity or sour smell was recorded.

[0032] Comprehensive judgment criteria: Samples that are uniform and transparent, without layering, sedimentation, turbidity, or rancidity, are considered qualified; samples that show any layering, sedimentation, or turbidity, or produce rancidity or other off-odors, are considered unqualified.

[0033] Results and Analysis: The test results are shown in Table 1. The samples of Examples 1-3 maintained good stability under various storage conditions. No abnormalities were observed after 12 months of storage at room temperature away from light. Under high-temperature accelerated and low-temperature cyclic conditions, only the samples of Examples 2 and 3 showed slight reversible turbidity, without layering, rancidity, or other problems. This indicates that the six-fold essential oil formula of this invention is scientific, and the preparation process can effectively prevent oil oxidation and rancidity, improve system compatibility, and provide excellent storage stability. The comparative example, due to its single formula and lack of core synergistic components, showed layering in the early stage of storage and obvious rancidity in the later stage, verifying the key role of the compound synergy of the formula of this invention in improving product stability.

[0034] Table 1. Results of Storage Stability Tests for Different Essential Oils Test group Store at room temperature and protected from light for 6 months 12 months at room temperature, away from light High temperatures accelerate by 3 months 30 cycles of low temperature Comprehensive judgment Example 1 Uniform and transparent, odorless Uniform and transparent, odorless Uniform and transparent, odorless Uniform and transparent, odorless qualified Example 2 Uniform and transparent, odorless Uniform and transparent, odorless Uniform and transparent, odorless Slight turbidity, which disappeared after returning to room temperature. qualified Example 3 Uniform and transparent, odorless Uniform and transparent, odorless Uniform and transparent, odorless Slight turbidity, which disappeared after returning to room temperature. qualified Comparative Example Slight separation, no odor It has obvious layers and a rancid smell. Severe separation, with a noticeable rancid smell. After freezing and solidifying, the mixture thaws and separates into layers, with no odor. Unqualified Human skincare efficacy test: Test basis: Designed according to the relevant test requirements of the "Cosmetic Safety Technical Specifications" (2015), to verify the actual improvement effect of the six-fold essential oil on dry, rough skin and damaged skin barrier, and to evaluate the gentleness of the product.

[0035] Test subjects: Eighty menopausal female volunteers aged 45-58 were selected, all of whom had varying degrees of skin barrier damage: stratum corneum moisture content ≤30%, transepidermal water loss (TEWL) ≥20 g / (m³). 2 •h), accompanied by symptoms such as dry, rough, itchy, and fine lines, excluding those with skin inflammation, a history of allergies, and recent (within 3 months) use of other functional skin care products. Volunteers were randomly divided into 4 groups of 20 each, using the samples from Example 1, Example 2, Example 3, and the comparative example, respectively. There were no significant differences in skin condition among the groups.

[0036] Test method: After cleansing their face every morning and evening, all volunteers took 0.5 to 1 mL of the corresponding sample and applied it evenly to their face, gently massaging until fully absorbed. They used it continuously for 28 days. During the test, they did not use other brands of skin care products or wear makeup.

[0037] Before use (day 0), at 14 days of use, and at 28 days of use, volunteers were allowed to sit still for 30 minutes in a standard environment with a temperature of 21±1℃ and a relative humidity of 50±10% before the following indicators were measured: The skin stratum corneum moisture content tester (CM825) was used to detect the moisture content of the cheekbone area on the face, and the improvement rate of stratum corneum moisture content was calculated. The TEWL value at the cheekbone location was measured using a Tewameter TM300 transdermal water loss meter, and the TEWL value improvement rate was calculated to assess skin barrier integrity. The skin elasticity value (F4) of the face was measured using a skin elasticity tester (MPA580), and the improvement rate of skin elasticity value (F4) was calculated. The face was photographed using the VISIA-CR skin analyzer, and the area ratio of fine lines was analyzed to calculate the improvement rate of fine line area. The formula for calculating the improvement rate is: .

[0038] Simultaneously, the improvement of volunteers' symptoms of dry, rough, and itchy skin was recorded, and the subjective effectiveness rate was calculated. The subjective evaluation criteria were: Significant effect: Dry, rough, and itchy skin symptoms completely disappear; fine lines area improvement rate ≥30%; Effective: Significantly relieves symptoms of dry, rough, and itchy skin; improves fine lines by 10%–30%; Ineffective: Skin symptoms show no improvement or even worsen, with a fine line area improvement rate of <10%; The formula for calculating the overall effectiveness is: .

[0039] Throughout the process, volunteers were observed for adverse reactions such as redness, stinging, and allergies to assess the product's mildness. The criteria for determining mildness were: Non-irritating: No adverse reactions such as redness, stinging, or allergies; Mild irritation: Temporary slight redness may occur, which will resolve on its own without treatment; Irritation: If obvious redness, stinging, or itching occurs, discontinue use.

[0040] Simultaneously calculate the incidence of mild sexual stimulation. .

[0041] The test results are shown in Tables 2, 3, and 4. Figure 1As shown in Table 2, after 28 days of continuous use, the stratum corneum moisture content and skin elasticity value (F4) of the samples in Examples 1-3 significantly increased, while the TEWL value and fine line area significantly decreased. The improvement rates of all objective indicators were much higher than those of the comparative example, and the improvement effect of all indicators in Example 1 was the best. This proves that the six-fold essence oil of this invention can repair the menopausal skin barrier from the root, effectively improving problems such as dryness, roughness, and fine lines. The scientific compounding and synergistic effect of the formula are significant. As shown in Table 3, the subjective total effective rate of Examples 1-3 is ≥90.0%, with Example 1 reaching 100%, which is much higher than the 50.0% of the comparative example. This is consistent with the objective indicator test results, verifying that the improvement effect of the product of this invention on menopausal skin barrier problems is subjectively recognized by the subjects. Table 3 shows that none of the 60 volunteers in Examples 1-3 experienced any irritation during the 28-day use period, with an irritation rate of 0.0%, indicating a mildness rating of no irritation. In contrast, the comparative group experienced a 10.0% irritation rate, indicating mild irritation. This demonstrates that the formula of this invention is natural and mild, with high purity after multiple filtration processes, and is non-irritating to sensitive and fragile menopausal skin, meeting the safety requirements for menopausal skin care. In contrast, a single formula, lacking synergy, can easily cause a slight burden on sensitive skin. Figure 1 It can be seen that after using the sample of Example 1 for 28 days, the skin color uniformity, smoothness and overall texture of the test area were significantly improved, which reflects the effect of the six-fold essence oil of the present invention on improving the skin barrier state during menopause.

[0042] Table 2. Results of improvement in objective indicators (used for 28 days, ± is the standard deviation). Test group Improvement rate of stratum corneum moisture content (%) TEWL value improvement rate (%) Skin elasticity value (F4) improvement rate (%) Improvement rate of fine line area (%) Example 1 56.89±3.25 48.65±2.98 22.36±2.15 35.89±3.02 Example 2 49.56±2.87 41.23±2.56 18.58±1.98 28.65±2.78 Example 3 52.13±3.01 43.89±2.75 20.15±2.03 31.23±2.95 Comparative Example 19.87±1.56 15.36±1.21 8.65±0.98 10.23±0.89 Table 3 Subjective efficacy rate (after 28 days of use) Test group Number of cases with significant effect Valid number of cases Invalid cases Overall effectiveness (%) Example 1 16 4 0 100.0 Example 2 12 6 2 90.0 Example 3 13 6 1 95.0 Comparative Example 2 8 10 50.0 Table 4. Mildness test results (after 28 days of use) Test group Number of cases without stimulation Number of cases of mild irritation Number of cases with stimulation Incidence of stimulation (%) Example 1 20 0 0 0.0 Example 2 20 0 0 0.0 Example 3 20 0 0 0.0 Comparative Example 18 2 0 10.0 The above stability and human skincare efficacy test results all prove that the six-fold essential oil formula of the present invention is scientifically precise, with significant synergistic effects of each component. The matching preparation process can fully guarantee the stability and efficacy of the product system, effectively solving the problems of poor compatibility, easy separation, limited repair effect, and easy irritation to sensitive skin in traditional oil-based skincare products. It is a highly effective and safe skincare product for menopausal skin barrier problems, with significant advantages over existing single-oil formulas. Among them, Example 1 shows the best performance in terms of stability, skincare efficacy, and gentleness.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the present invention.

Claims

1. A six-ingredient essential oil for improving menopausal skin barrier problems, characterized in that, By weight percentage, the raw material composition includes: meadowfoam seed oil 38-41%, evening primrose oil 18-22%, egg yolk oil 13-17%, sea buckthorn fruit oil 13-17%, Sacha inchi seed oil 4-6%, borage seed oil 4-6%, and tocopheryl acetate 0.3-0.7%.

2. The six-fold essential oil according to claim 1, characterized in that, By weight percentage, the raw material composition includes: meadowfoam seed oil 39.5%, evening primrose oil 20%, egg yolk oil 15%, sea buckthorn fruit oil 15%, Sacha inchi seed oil 5%, borage seed oil 5%, and tocopheryl acetate 0.5%.

3. A preparation process for a six-fold essential oil as described in claim 1 or 2, characterized in that, Includes the following steps: S1. Raw material pretreatment: Meadowfoam seed oil, evening primrose oil, sea buckthorn fruit oil, Sacha Inca seed oil, and borage seed oil are vacuum filtered through microporous membranes to remove impurities. Egg yolk oil is melted in a constant temperature water bath and then filtered to remove impurities for later use. S2. Basic oil dispersion: Pretreated meadowfoam seed oil, evening primrose oil and sea buckthorn fruit oil are added to the reactor and pre-stirred to form the basic oil phase; S3. Stepwise compounding: Add egg yolk oil, Inca Inchi seed oil and borage seed oil to the base oil phase in sequence, and stir stepwise to form a compound oil phase; S4. Addition of antioxidant components: Slowly add tocopheryl acetate to the complex oil phase, and stir to disperse after the addition is complete; S5, Gradient Filtration Refining: The mixed oil system is sequentially subjected to coarse filtration and fine filtration; S6. Degassing and Discharging: After vacuum degassing the filtered oil system, discharge it in the dark, seal and fill it to obtain the six-fold essential oil.

4. The preparation process according to claim 3, characterized in that: The microporous filter membrane described in step S1 has a pore size of 0.22 μm and is made of PTFE or PVDF.

5. The preparation process according to claim 3, characterized in that: The temperature of the constant temperature water bath for the egg yolk oil in step S1 is 35-45℃.

6. The preparation process according to claim 3, characterized in that: The coarse filtration in step S5 uses a 200-mesh filter screen, and the precision filtration uses a 0.22 μm microporous filter membrane.

7. The preparation process according to claim 3, characterized in that: The vacuum degree of vacuum degassing in step S6 is -0.08 to -0.10 MPa, and the degassing time is 3 to 5 minutes.

8. The use of the six-fold essential oil as described in claim 1 or 2 in the preparation of cosmetics for improving dry, rough, sensitive, red, and fine-lined skin in menopausal women and for repairing the skin barrier.

9. The application according to claim 8, characterized in that, The cosmetic product is one or more of the following: facial essence oil, body care oil, and neck care oil.

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