Science
Mechanism of Action
This ingredient mimics the skin's Natural Moisturizing Factors (NMF) by delivering a blend of peptides and amino acids, thereby replenishing moisture. It acts as a humectant, drawing and retaining water in the stratum corneum to boost hydration, resulting in softer and smoother skin. It also fortifies the skin barrier by interacting with keratin, creating a moisture-retentive network that minimizes transepidermal water loss (TEWL). Additionally, its soy peptides and isoflavones provide antioxidant benefits, neutralizing free radicals and mitigating oxidative stress from environmental factors like UV radiation and pollution. Some evidence suggests it may also support collagen and elastin synthesis, promoting skin elasticity and cell renewal.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Regularly incorporated into face and neck skincare preparations, demonstrating its utility in cosmetic formulations.
- 02 In in vitro models (C. elegans), a 20% hydrolyzed soy protein solution (at 300 µg/mL or 0.03% of the active ingredient) significantly enhanced antioxidant enzyme activities and improved resistance to oxidative stress.
Transparency
Dusting Analysis
PG-Hydrolyzed Soy Protein is utilized in various skincare products, with concentrations up to 4% reported in face and neck preparations. Efficacy studies, even in alternative models, indicate benefits at concentrations as low as 0.03%, suggesting genuine functional inclusion rather than minimal 'dusting' for marketing purposes.
The Formula
Formulation
Stability
The hydrolysis process enhances the solubility and thermal stability of soy protein. While soy protein isolate shows increased solubility at pH 2.0 and 9.0 (with lowest solubility around pH 4.0-5.0), hydrolyzed proteins generally demonstrate good stability and solubility across a broad pH range, typically from pH 2 to 10.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has deemed soy proteins and peptides, including Hydrolyzed Soy Protein, safe for cosmetic use within current practices and concentrations. The panel noted its water-soluble nature and molecular weight, which is too low to induce Type I hypersensitivity reactions via dermal exposure. However, individuals with pre-existing soy allergies should exercise caution and consult a dermatologist prior to use. The 'PG' in this ingredient name denotes propylene glycol as an alcoholic component, which is deemed safe in formulation.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PG-Hydrolyzed Soy Protein is a valuable multifunctional ingredient, offering significant hydration, barrier support, and antioxidant protection suitable for all skin types due to its excellent safety profile.
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