INCI · humectant · CIR review pending · used in 2 products
Pca
PCA (Pyrrolidone Carboxylic Acid), also known by its IUPAC name L-2-Pyrrolidone-5-Carboxylic Acid (CAS# 98-79-3), is a naturally occurring component found in human skin. It is classified as a skin-identical ingredient and is the second largest component of the skin's Natural Moisturizing Factor (NMF), accounting for approximately 12% of NMF composition in normal skin. It functions as a humectant and moisturising agent according to official CosIng data.
Evidence level
moderateEWG score
—Comedogenic
—Category
humectant● Benefits
PCA helps the skin hold onto water and maintain hydration, functioning similarly to other NMF components. As a skin-identical ingredient, it supports the skin's natural moisture-retention mechanisms.
hydratingbarrier-support
● Cautions
