How to Use: Kristy recommends applying 4-6 drops onto your fingertips, allowing the warmth of your hands to activate the serum. Gently smooth it over your face, allow the serum to absorb fully.

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Sofie Pavitt is NYC's acne whisperer, and her award-winning mandelic acid serum is a must-try if you're dealing with clogged pores or acne. The Cosmo beauty team is collectively obsessed with how well ...

When it comes to achieving bright, glowing skin, a vitamin C serum is key. But not all vitamin C serums are created equal—and ...