Ingredient

Stearic acid

Fatty acid that supports the barrier and thickens creams.

What it does

Softens · Blends oil and water

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, Normal

Typical amount

1-5% in a formula

Best time

Morning or evening