CAS Number 54571-67-4 corresponds to Sodium PCA, which is the sodium salt of pyroglutamic acid, also known as PCA. PCA is a naturally occurring component found in human skin and is part of the "natural moisturizing factors" (NMF) responsible for maintaining a healthy epidermis. Sodium PCA is highly hygroscopic, meaning it attracts moisture from the air, providing a moisturizing sensation to both hair and skin.
When applied to the skin, Sodium PCA is absorbed to a limited extent. It possesses non-comedogenic properties and is non-irritating to the eyes and skin, even at concentrations up to 50%. Additionally, it does not contribute to phototoxicity or sensitization and is rapidly biodegradable. This ingredient is soluble in water and ethanol but insoluble in oils, making it a valuable addition to a variety of skin and hair care products, including gels, creams, lotions, shampoos, conditioners, lipsticks, and foundations.
Importantly, the Sodium PCA discussed here is sourced from all-natural, vegetable-based ingredients, containing no animal-based components.
International Nomenclature of Cosmetic Ingredients
(INCI): Sodium PCA
Recommended Usage Percentage: 0.2 - 2.5% in leave-on products, up to 3% in rinse-off products
Appearance: Clear, syrupy liquid
Preservative: None, product as supplied is unpreserved
Solubility: Soluble in water
Country of Origin: Brazil