If you know anything about skincare products, you know the benefits of a vitamin C serum. It’s a potent antioxidant that protects against the cellular damage caused by pollution and sun exposure. It also brightens skin and helps fade dark spots over time. And it builds collagen, which is a lovely attribute if you like your face to be plump and bouncy.
But there’s a hitch—isn’t there always? Vitamin C is unstable and loses potency when it’s exposed to light or oxygen. Our science guy explains how to find a vitamin C that works and avoid those that fall apart under pressure. —Linda Wells
