Ingredient dictionary

Sodium PCA

Also listed as: PCA, Sodium pyrrolidone carboxylate

Sodium PCA is a salt of a natural amino acid derivative found in skin's natural moisturizing factor. It works as a humectant, drawing water into the skin and hair. It is on the label of 16 products in our library. Checked against our library November 6, 2026.

What Sodium PCA does

Draws water into the outer skin layer
Helps hair and skin hold moisture
Adds light, water-based hydration

Sodium PCA is the sodium salt of pyrrolidone carboxylic acid, a molecule related to amino acids. It is also found in the skin's natural moisturizing factor, a mix that helps skin hold water. In products it is usually made from glutamic acid, an amino acid, through heating.

Formulators use it because it is an effective humectant that works well in water-based products. It dissolves easily and does not add heavy texture, so it fits into serums, cleansers, and conditioners. On skin and hair it feels light, which is why it shows up in many everyday products.

Good for

Dry or dehydrated skin and hair, and anyone wanting light, water-based hydration.

Frequently asked questions

Is Sodium PCA safe for sensitive skin?

It is generally well tolerated and is a common ingredient in gentle formulas. As with any new product, a small patch test on the inner arm before full use is a good habit, especially if your skin reacts easily.

Does Sodium PCA make hair greasy?

It is not known for leaving hair greasy when used in normal amounts. Because it attracts water, it works best in humid air. In very dry climates, it may not add as much moisture, so pairing it with a richer conditioner can help.