Ingredient

Ethyl ascorbic acid

On labels: 3-O-Ethyl Ascorbic Acid

Stable vitamin C derivative popular in Asian brightening serums.

What it does

Brightens the look of skin · Antioxidant

Evidence

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

Often chosen for

Dark spots and post-breakout marks, Dull, uneven-looking tone

Skin types

Dry, Oily, Combination, Normal

Typical amount

1-3% in a formula

Best time

Morning or evening