Cocoyl Proline

Cocoyl Proline is an amino acid–derived surfactant (cocoyl acyl proline) used in cleansers and shampoos, generally formulated to be milder than classic anionic surfactants at typical use levels. Available patch-test and clinical experience with amino-acid surfactants suggest low but not zero irritation risk—especially with leave-on residue, high total surfactant load, or compromised barriers (eczema, post-procedure). Given cumulative cleansing-related barrier disruption in real routines, I rate it as gentle rather than very-gentle/inert. Safety Notes: Cocoyl Proline (a mild amino-acid-derived surfactant/conditioning agent) is most often encountered in rinse-off cleansers and shampoos at low inclusion levels as part of a blended surfactant system, where it may appear around 0.05–1% to boost mildness/foam and skin feel. In higher-activity cleansing formats and some sulfate-free “amino acid surfactant” systems available OTC, it can be used several percent up to about 10% (as supplied), typically in rinse-off products rather than leave-on due to surfactant character and potential for irritation at higher levels. There are no specific FDA/EU cosmetic maximum limits for this ingredient itself; practical upper levels are driven by mildness, viscosity, and overall surfactant-active balance.