Science
Mechanism of Action
This ingredient functions by leveraging its key components, including phytoestrogens (isoflavones), which act as selective estrogen receptor modulators (SERMs). These compounds can mimic estrogen's effects, upregulating ERβ in dermal fibroblasts to stimulate collagen synthesis and maturation. This process contributes to increased epidermal thickness, improved dermal collagen density, and greater elastic fiber content, thereby reducing the visibility of fine lines and wrinkles. Soaked in moisturizing properties, it helps renew dead skin cells and can boost the skin's natural hyaluronic acid levels, significantly enhancing hydration. Its antioxidant capabilities combat photoaging by neutralizing free radicals from sun exposure. Additionally, smaller soy proteins, such as soybean trypsin inhibitor, are believed to reduce skin pigmentation by inhibiting melanosome transfer, preventing melanin from surfacing. Overall, it supports skin barrier repair, offers anti-inflammatory benefits, strengthens connective tissues, improves skin elasticity, and assists in regulating oil production.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Oral daily consumption of one cup of soymilk for eight weeks subjectively and objectively improved skin health in postmenopausal women.
- 02 Oral supplementation with 100 mg of isoflavone-rich concentrated soy extract daily for 6 months resulted in a 9.46% increase in epidermal thickness, enhanced dermal collagen, and increased elastic fiber count in 23 of 29 post-menopausal women.
- 03 Oral supplementation with 50 mg of standardized soy protein isolate with isoflavones significantly improved facial wrinkle severity and increased skin hydration.
- 04 Topical soy formulations have demonstrated efficacy in improving signs of aging and providing protection against ultraviolet light.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Soy Protein Isolate (SPI) exhibits enhanced stability with a reduction in pH from 8 to 5, with pH 6 generally being favorable for storage. High protein concentrations in reconstituted soymilk powder can lead to precipitation. The manufacturing spray-drying temperature significantly influences the powder's solubility.
Conflicts
- Individuals with diagnosed soybean allergies should avoid products containing soymilk powder.
- Due to its phytoestrogen content, it may potentially exacerbate melasma, an estrogen-mediated condition.
- In very sensitive individuals, high concentrations or specific soy extracts could induce irritation, such as erythema.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has concluded that soy proteins and peptides, including hydrolyzed soymilk protein, are safe for use in cosmetics at current concentrations. Studies indicate no relevant ocular irritation, dermal irritation, or sensitization in animal or human subjects. While soy proteins are recognized food allergens, the CIR Panel deemed dermal exposure unlikely to trigger Type I immediate hypersensitivity reactions due to limited skin penetration and water solubility. However, one clinical case reported aggravation of rosacea in a patient using soy-containing facial products, and individuals with known soybean allergies should avoid this ingredient. The SCCS status for 'SOYMILK POWDER' is not explicitly found. Soy-derived ingredients are not utilized as active pharmaceutical ingredients in US FDA-approved medical preparations, although soybean oil is an approved intravenous medication component.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Soymilk powder is a valuable multi-functional ingredient, offering significant anti-aging, hydrating, antioxidant, and brightening benefits, particularly beneficial for mature and dehydrated skin, with a generally low irritancy profile.
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