Hydrolyzed Vegetable Protein

Hydrolyzed vegetable protein is primarily a conditioning/film-forming humectant used at low concentrations in cosmetics, and it is generally well tolerated with low rates of irritant reactions in routine use. However, as a protein hydrolysate it can contain small peptides and residual source components that occasionally trigger stinging or dermatitis in highly reactive or compromised skin, so it is not truly inert. Given sensitive-skin and eczema populations, I score it as gentle but not risk-free. Safety Notes: In consumer skin and hair products, hydrolyzed vegetable protein is commonly used at very low levels (~0.05–0.3%) as a conditioning/film-forming supportive ingredient in leave-on lotions/serums and rinse-off cleansers where it appears mid-to-late INCI and is often part of a supplier blend. Higher-strength OTC products such as hair masks, conditioners, and some “protein treatment” style formulations marketed to consumers can reach ~1–5% active protein (especially in rinse-off systems or thicker masks) before sensorial/stability issues (tackiness, build-up, viscosity and salt/pH sensitivity) typically limit further increases. It is not specifically concentration-restricted in major cosmetic regulations (EU/FDA), so the upper end is driven primarily by formulation performance and consumer acceptability rather than legal caps.