These 9 Vitamin C Serums Are Total Holy Grails, According to Derms

"Not only is this serum loaded with vitamin C, but it also has a non-greasy (and smooth!) finish so that you can use this together with other products," says Dr. Channing Barnett, MD of this two-in-one beauty buy. "I often use this product multiple times a day, because it quickly makes aged skin feel resilient again."

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