7 Skin Care Ingredients You Should Never Mix, According to Derms

Yes, a supercharged vitamin C serum and AHA/BHA mask may seem like the dream team duo you need to achieve that #nofilter glow... however, Dr. Pierre and Dr. Miller both caution that they generally shouldn't be mixed.

"Aside from potential tolerability issues and the potential of causing a lot of irritation, these acids can destabilize vitamin C, and significantly decrease its effectiveness," he explains. "It's best to use vitamin C products in the morning, and then relegate your AHA/BHA product in the evening." Dr. Miller agrees, adding "Vitamin C acts as an antioxidant, and AHA acts to exfoliate, but they can also deactivate each other."

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