What Is a Vitamin C Serum Exactly, and What’s in It?
A vitamin C serum is a skin-care product packed with vitamin C. It has the consistency of a liquid or gel, and is applied topically to the skin. You’ll find these serums wherever you normally purchase skin-care products — at department stores, beauty stores, and some drugstores, too. On the packaging, you’ll likely see words touting skin benefits like “firming,” “brightening,” and “collagen boosting.” People add vitamin C serum to their skin-care routines to tap into those benefits.

“The benefit of vitamin C is it’s an antioxidant, so it helps prevent the forming of free radicals, which go on to break down collagen and elastin,” Dr. Saedi says. The result, she says, is glowing, youthful skin.
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