From the Manufacturer's Label:
Twin Lab Na-PCA is a Ph-balanced, concentrated solution of the sodium salt of pyrrolidone carboxylic acid, the natural moisturizing factor found in human skin. Na-PCA is a synthesized from glutamic acid, a nonessential amino acid.
Non-Oily. Hypo-Allergenic, Non-Comedogenic & Paraban Free
Manufactured by Twinlab.Paraben Free, Noon-Comedogenic