Science
Mechanism of Action
Soy isoflavones act as phytoestrogens, stimulating collagen synthesis to improve skin elasticity and reduce wrinkles. Soymilk contains glycine, an amino acid vital for collagen and elastin production. It exhibits antioxidant properties, protecting against free radicals and reducing oxidative stress. The ingredient aids in barrier repair, may boost natural hyaluronic acid levels for increased hydration, and functions as an anti-inflammatory by reducing pro-inflammatory mediators like TNF-α. Small soy proteins can also contribute to inhibiting skin pigmentation.
Research
Clinical Evidence
Medium confidence0.1% - 0.2% (for fermented soymilk fractions topically)
Key findings
- 01 In postmenopausal women, a 24-week trial demonstrated a significant reduction in average wrinkle severity (5.9% at week 16, 7.1% at week 24), a decrease in facial pigment severity (2.4% at week 24), and increased skin hydration (39% on left cheek, 68% on right cheek).
- 02 Improved subjective and objective skin health was observed in premenopausal women after 8 weeks, with improvements dissipating upon cessation of consumption.
- 03 Increased procollagen synthesis by 164.23% in UVB-irradiated human dermal fibroblasts.
- 04 Inhibited TNF-α production by 23.23% and 23.44% respectively in UVB-irradiated HaCaT keratinocytes, demonstrating effective inflammation inhibition.
Transparency
Dusting Analysis
Clinical studies have shown significant efficacy for topical fermented soymilk fractions at concentrations as low as 0.1% to 0.2%, indicating that the ingredient can be effectively incorporated into formulations at meaningful levels without being merely 'dusted' for marketing purposes.
The Formula
Formulation
Stability
Soymilk functions as an emulsion system, prone to instability, creaming, and sedimentation during storage. Its physical stability, viscosity, and particle size are significantly influenced by pH, with stability notably decreasing at pH levels below 5.8. The optimal initial fermentation pH for soymilk was determined to be 6.0, suggesting formulations around this pH would be more stable. Polysaccharides, such as glucomannan, can be used to enhance stability by binding water.
Conflicts
- Instability at pH levels below 5.8
- Potential 'beany' off-flavor in formulations
Safety
Safety Profile
The CIR Expert Panel concluded that most soy-derived ingredients, including Hydrolyzed Soymilk Protein, are safe in cosmetics at concentrations up to 3.5%. While soy proteins are recognized food allergens, the panel noted that dermal exposure is less concerning due to their water solubility, low molecular weights, and limited skin penetration. Studies showed no skin irritation or allergic reactions from cosmetic use. However, soymilk is listed as a common allergen causing sensitivity in some skincare patients, thus a moderate sensitization risk is assigned.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Soymilk is a valuable ingredient, clinically shown to improve signs of photoaging, enhance hydration, and offer significant anti-inflammatory and collagen-boosting benefits for diverse skin types.
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