How antioxidants work If free radicals are your enemies, then antioxidants are your heroes. "Antioxidants provide the missing electron so the [free radical] molecules don't try to take them from your skin," says Baumann, who suggests using an antioxidant serum that's a combination of vitamin C, vitamin E, and ferulic acid, like SkinCeuticals C E Ferulic, $146. "The vitamin E helps stabilize the vitamin C, and ferulic is an antioxidant as well as a sunscreen," she says.
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