Sodium Palmitoyl Sarcosinate

Sodium Palmitoyl Sarcosinate is an anionic surfactant/cleansing agent typically used around ~0.5–5% in rinse-off products, where it is generally milder than harsher sulfates but can still disrupt the stratum corneum and sting compromised skin. Patch/irritation testing for sarcosinate surfactants supports low-to-moderate irritation potential, with higher risk in eczema, barrier-impaired, or over-cleansed users and with cumulative exposure in multi-step routines. Given patient-safety considerations for highly reactive skin, I rate it as mild: usually tolerated but capable of provoking irritation in susceptible individuals. Safety Notes: Sodium palmitoyl sarcosinate is a mild anionic surfactant/foam booster most commonly found in rinse-off facial cleansers and body washes, where it can appear at low “supporting” levels (~0.05–0.5%) in blends to improve mildness and lather alongside other surfactants. In consumer-available high-foaming cleansers/shampoos and some acne/oily-skin washes, it can be used as a primary surfactant in the several-percent range, with upper-end commercial formulas reaching about 8–10% active to drive foam and detergency. Leave-on use is uncommon and typically kept at very low levels (generally ≤0.1–0.5%) due to irritation risk and surfactant sensorial constraints, so the market high end is driven by rinse-off products.