Ingredient

Sodium PCA

Part of skin's own natural moisturizing factor, keeps skin supple.

What it does

Hydrates

Evidence

Evidence: Moderate · Some good studies; results vary from person to person.

Often chosen for

Dry, tight-feeling skin, Over-exfoliated, stressed skin

Skin types

Dry, Oily, Combination, Normal, Sensitive

Typical amount

0.5-2% in a formula

Best time

Morning or evening