Common ingredients such as vitamin C, AHA and benzoyl peroxide have a handful of ingredients that they don't pair well with, per Allure.
Ingredients to avoid mixing include:
-
Vitamin C + Benzoyl Peroxide
-
Vitamin C + AHA
-
AHA + Hydroquinine
-
Hydroquinone + Benzoyl Peroxide
-
Benzoyl Peroxide + Dapsone
Using these ingredients together can cause issues such as dullness, skin staining or irritation.