What it does
- Draws and holds water for effective, light hydration.
- Is part of the skin's natural moisturising factor (NMF).
- Improves suppleness and skin feel.
How it works
Sodium PCA (the sodium salt of pyrrolidone carboxylic acid) is one of the skin's own NMF components and a strong humectant that binds water effectively at low use levels. It is widely documented as a gentle, well-tolerated moisturiser.
Use level
- Typical use level
- typically 0.2–2.5%
Commonly used at 0.2–2.5%; effective at modest levels.
Formulation considerations
- Water-soluble; add to the water phase.
- Very hygroscopic; store the raw material sealed.
- Broadly compatible and gentle.
What it pairs with & what to avoid
Pairs well with
- Glycerin, hyaluronic acid and other humectants
- Occlusives to seal
Use with care / avoid
- No notable incompatibilities
Regulatory status
Sodium PCA is listed in the EU CosIng database and is a well-established humectant.
Common questions
What does sodium PCA do?
It is a strong humectant and part of the skin's natural moisturising factor, giving light, effective hydration.
What percentage of sodium PCA is used?
Typically 0.2–2.5%.
Is sodium PCA good for the skin barrier?
As an NMF component it supports the skin's own moisture handling and is gentle and well tolerated.