Retinol and Vitamin C
Can they be mixed" Yes, with reservations

Two of the hottest skin care ingredients of the moment might be a little too harsh to be used together, so Gohara actually recommends using them in different parts of your routine. "I like using vitamin C in the morning, right after I get out of the shower, and use a retinol at night," she says. Since "ultraviolet light can inactivate retinol" and "Vitamin C makes a good warrior against free radicals you come in contact with during the day," you get the best of both worlds that way. Gohara notes that this logic holds true for other antioxidants as well. Image: @vichyusa

Vitamin C and AHAs
Can th...