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Ingredient

Vitamin C

Also called: L-ascorbic acid, Ascorbic acid

The morning antioxidant most people benefit from, especially when paired with sunscreen.

Sharon’s verdict

Worth it

What Sharon would tell you

Vitamin C neutralizes free radicals, brightens skin, and helps sunscreen do its job better. L-ascorbic acid between 10 and 20 percent has the strongest evidence, but it is also unstable.

Look for opaque or dark packaging and throw it out if it turns brown or smells off. If L-ascorbic acid irritates you, gentler derivatives can still be useful, just less potent.