- Sodium PCA is the sodium salt of pyroglutamic acid (also known as PCA). - PCA is a naturally occurring component of human skin and a part of the "natural moisturizing factors" (NMF) that maintain a healthy epidermis. Sodium PCA is very hygroscopic, attracting moisture from the air. - It imparts a moist feeling to hair and skin. - Sodium PCA applied to the skin is absorbed to a limited extent. It is non-comedogenic, nonirritating to the eye and skin -- even at concentrations up to 50%, and does not contribute to phototoxicity or sensitization. - It is rapidly biodegradable. - Soluble in water and ethanol and insoluble in oils, - it is used for its powerful humectant properties in many skin and hair care products including gels, creams, lotions, shampoos, conditioners, lipsticks and foundations. - This PCA is sourced from all-natural, vegetable-based ingredients; it contains no animal-based ingredients of any kind.