Ingredient

Vitamin C derivative (MAP)

On labels: Magnesium Ascorbyl Phosphate

Hydrating, gentle form of vitamin C.

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, Combination, Normal, Sensitive

Typical amount

1-5% in a formula

Best time

Morning or evening