L-ascorbic acid is the most powerful type of vitamin C and can help brighten skin and prevent signs of aging. Here are the best L-ascorbic acid serums, according to derms and editors.

Microencapsulated Malic Acid There’s a persistence to the sour in Warheads. To prolong the pucker, malic acid (the stuff that gives apples their natural tartness) is coated with hydrogenated ...

A small 2004 study found that using 5% ascorbic acid cream — a form of vitamin C — for 16 weeks reduced hyperpigmentation for 62.5% of participants. How to use it: ...

The Timeless Skin Care 20% Vitamin C + E Ferulic Acid Serum brightens and smoothes skin while reducing wrinkles. It’s comparable to higher-end alternatives, and you can shop it for $26 at Amazon.

Ascorbic acid is great for brightening skin that's dull and has lost its radiance. It also targets fine lines and free-radical damage, which is great for those over 30.