Moisturizers, serums, essences, oils, mists: the list of “must-have” beauty products goes on. It can be hard to parse out what you actually need from what’s just a marketing ploy.

But even if you don’t want to spend a lot of time or money on an exhaustive skin care routine, adding a serum might be your ticket to clear, bright, even-toned skin, dermatologists say.

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