Ingredient dictionary

Sodium PCA

Also listed as: Sodium Pyrrolidone Carboxylate

Sodium PCA is a salt that helps skin and hair hold water. It is a humectant, meaning it draws moisture in and keeps it in the formula. It is on the label of 42 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Sodium PCA does

Draws water into skin or hair
Helps skin feel soft and smooth
Adds moisture without heavy oils

Sodium PCA is the sodium salt of pyrrolidone carboxylic acid, often shortened to PCA. Skin already makes PCA as part of its natural moisturizing factor, a group of small molecules that help the outer layer hold water. Manufacturers usually make sodium PCA from glutamic acid, an amino acid, which is heated and then neutralized with a sodium base.

Formulators like sodium PCA because it dissolves easily in water and blends well with other ingredients. It tends to feel light rather than greasy on the skin. That is why it turns up in body lotions, shampoos, conditioners, concealers, and setting sprays, where a little extra moisture helps the product feel comfortable.

Good for

Good for people who want a light, water-based hydration boost, especially if their skin or hair feels dry or tight.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is sodium PCA the same as PCA?

Not quite. PCA is the acid form, and sodium PCA is its sodium salt. The salt form is easier to dissolve in water, so it is the version usually found in cosmetic formulas.

Does sodium PCA work for dry skin?

It can help. As a humectant, sodium PCA draws water into the outer layer of skin, which can leave skin feeling softer. Many people pair it with a richer ingredient that helps seal moisture in.