Science
Mechanism of Action
Functioning by delivering short-chain peptides and amino acids, Sodium Stearoyl Hydrolyzed Soy Protein effectively mimics the skin's inherent Natural Moisturizing Factors (NMF), thereby attracting and retaining water to form a robust moisture-retentive film on the skin's surface. This action significantly boosts hydration and improves skin texture. Furthermore, it strengthens the stratum corneum, reducing transepidermal water loss (TEWL) and bolstering overall barrier function. Its soy-derived components, including peptides and isoflavones, offer substantial antioxidant benefits by neutralizing free radicals from UV radiation and environmental pollutants. The ingredient also stimulates cell renewal, refines skin texture, and promotes the synthesis of hyaluronic acid and collagen, which are crucial for addressing visible signs of aging like fine lines and loss of elasticity.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
While specific quantitative efficacy studies for SODIUM STEAROYL HYDROLYZED SOY PROTEIN are not extensively detailed, its well-understood mechanism and derivation from hydrolyzed soy protein with established benefits suggest it is included for genuine formulation efficacy rather than merely for claims.
The Formula
Formulation
Stability
Specific optimal pH for Sodium Stearoyl Hydrolyzed Soy Protein's stability is not precisely defined in the research. However, related soy protein hydrolysates exhibit improved solubility and thermal stability through enzymatic processing. Soy protein generally shows minimal solubility near its isoelectric point (~pH 4.6), with significantly enhanced solubility in more acidic or alkaline conditions, potentially reaching near-complete solubility around pH 11. Solubilization during soy protein isolate preparation typically involves adjusting to pH 8.0-9.0, with caution advised against exceeding pH 9.0 to prevent undesirable compound formation.
Safety
Safety Profile
The CIR Expert Panel concluded that parent ingredients like Hydrolyzed Soy Protein, from which this ingredient is derived, are safe in cosmetics within current practices. Safety studies demonstrated no dermal irritation or sensitization up to 25% for Hydrolyzed Soy Protein. The FDA also recognizes Hydrolyzed Soy Protein (or Hydrolyzed Vegetable Proteins from soy) as Generally Recognized As Safe (GRAS) for food use. The CIR Panel specifically addressed concerns regarding soy as a food allergen, noting that dermal exposure is unlikely to cause Type I hypersensitivity reactions due to the water-soluble nature and molecular weight of soy proteins preventing significant skin penetration.
Your Skin
Skin Compatibility
Our Assessment
Verdict
SODIUM STEAROYL HYDROLYZED SOY PROTEIN is a valuable multi-functional ingredient, offering robust hydration, barrier reinforcement, antioxidant protection, and anti-aging benefits for a wide range of skin types, with a strong safety profile.
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