Lysine stands for the amino acid lysine (2,6-diaminohexanoic acid). PCA" is the abbreviation for esters or salts of pyrrolidone carboxylic acid (pyrroglutamic acid).
Lysine PCA is used in cosmetic formulations. The substance acts as an antistatic agent (reduces static charges by neutralizing the electric charge on the surface of e.g. hair), moisturizing agent (preserves the moisture of the skin) and skin care products.