Ingredient

Pentylene glycol

Hydrates and helps keep the formula fresh, often used in place of harsher preservatives.

What it does

Hydrates

Evidence

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

Often chosen for

Dry, tight-feeling skin

Skin types

Dry, Oily, Combination, Normal, Sensitive

Typical amount

1-5% in a formula

Best time

Morning or evening