Also known as: Sodium Pyrrolidone Carboxylate, NaPCA
Sodium PCA (pyrrolidone carboxylic acid) is a component of the skin's natural moisturising factor and one of the most effective humectants available. It is highly hygroscopic, meaning it readily absorbs moisture from the air. It helps maintain optimal skin hydration levels and supports the integrity of the skin barrier.
Comedogenicity ratings are based on the rabbit ear assay model. Individual skin responses vary. See our article on comedogenicity ratings for context.
The Ingredient Journal
Every week we break down one ingredient in depth — the science, the claims, and what the label is not telling you.