Vitamin C + benzoyl peroxide
Keep them apartKeep them apart. Benzoyl peroxide can oxidize vitamin C and cut its potency - layer them together and your brightening serum does less than you paid for.
The split is easy: vitamin C in the morning (it pairs naturally with sunscreen for daytime protection), benzoyl peroxide at night, or alternate days.
This one's about chemistry, not danger - the two won't hurt your skin together the way some pairs can, they just waste each other. Separating them means both actually work.
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