Topical Vitamin C: . Topical vitamin c is sold in a wide range of products from serum to lotions. Look for products that contain between 3% and 10% of vitamin c . Apply topical vitamin c once a day, ideally after you’ve exfoliated in the morning to utilize vitamin c’s sun-protecting properties. On occasions, topical vitamin c can cause some mild dryness or flaking. Counteract this side effect with a moisturizer.
Answered 3/12/2018
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