Glycine Soja Protein

Glycine Soja (soy) protein is a film-forming/conditioning ingredient typically used at low concentrations in creams and serums, and it is generally well-tolerated with low inherent irritancy. However, as a plant-derived protein it carries a measurable risk of sensitization or allergic contact reactions in a small subset of users (particularly highly reactive/atopic individuals), so it cannot be scored as very gentle or inert. In eczema-prone populations, I treat protein allergens cautiously because cumulative exposure in leave-on products can trigger flares despite an otherwise mild irritation profile. Safety Notes: In commercial skincare, Glycine Soja (Soybean) Protein is most often used as a film-forming/conditioning and skin-feel agent in leave-on lotions, serums, and eye products at very low levels (~0.01–0.5%), especially when supplied as a dilute aqueous protein solution. Higher-strength consumer products marketed for firming/anti-aging or lifting effects (typically leave-on) can reach ~1–5% active protein-equivalent, with practical upper limits driven by viscosity, odor/color, and stability; rinse-off products are usually at the low end because contact time is short. There is no specific EU/FDA cosmetic maximum for soy proteins, so the observed cap is mainly formulation and sensorial tolerance rather than regulatory.