Pyrrolidone Carboxylic Acid (PCA)

Pyrrolidone Carboxylic Acid (PCA) is a water-soluble humectant and a natural component of the skin's moisturizing factors. It binds ambient moisture and boosts surface suppleness, easing feelings of tightness in leave-on hydrators.
Like this ingredient?

Ingredient Snapshot

Overview
PCA is a natural moisturizer that keeps skin plump and hydrated.
Category
Hydration, Skin Conditioning, Barrier Support
Type
Humectant

Ingredient Ratings

Overall Rating

Great

Comedogenic Risk

None

Skin Benefits

Helps keep skin comfortably moist and bouncy, easing the look of dehydration lines, and leaves a smoother feel by mitigating flakiness from dryness.

Uses In Skincare & Cosmetics

Included in hydrating toners, essence mists, sheet masks, and water-gel serums for daily moisture support.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

Generally well tolerated and non-sensitizing for most users; mild stinging can occur on compromised or very sensitive skin. No known cosmetic regulatory restrictions at typical concentrations.

Is Pyrrolidone Carboxylic Acid (PCA) a Good Ingredient?

Great, because PCA is a well-studied component of skin's own natural moisturizing factors, with strong humectant performance, good formula stability, and typically low irritation at cosmetic use levels. That combination of proven mechanism and consistent real-world performance is what pushes it past Good.

Related Ingredients