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Pca

What Pca is & what it does

PCA (pyrrolidone carboxylic acid) is a small organic acid that occurs naturally in skin as part of its natural moisturizing factor. In cosmetic and sunscreen formulas it is used, often as a salt such as sodium PCA, to bind water and support hydration. A notable property is its strong humectant capacity, which helps draw and hold moisture in the upper skin layers.

What does PCA do in skincare?

PCA, usually present as a salt such as sodium PCA, acts as a humectant in skincare. It binds water and helps the skin's surface stay hydrated, and it is part of the skin's own natural moisturizing factor. In sunscreens and creams it supports a smooth, well-hydrated feel.

Is PCA safe?

PCA is a small organic acid that occurs naturally in skin and is widely used in cosmetics, where it is generally regarded as well tolerated at the levels used. As with any ingredient, individual sensitivities can occur. If you have specific concerns, a patch test or a chat with a dermatologist is a sensible step.

Is PCA natural or synthetic?

PCA occurs naturally in the skin as part of its moisturizing factor, but the PCA used in cosmetics is typically produced synthetically for purity and consistency. The molecule made in the lab is the same kind of compound found in skin. This lets formulators use a controlled, reliable grade.

Sunscreens with Pca

We rate 22 sunscreens that contain it, showing the top 10 by overall score:

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