Retinoid + benzoyl peroxide
Keep them apartKeep them apart. Benzoyl peroxide can oxidize and weaken some retinoids (like retinol), and used at the same time the two over-irritate: dryness, redness, peeling.
The fix is a schedule, not a sacrifice. Use benzoyl peroxide in the morning and your retinoid at night. Both still work; your barrier keeps its composure.
One exception: adapalene is stable next to benzoyl peroxide, so that pair can share a routine. If your retinoid is adapalene, you have more room.
New to either one? Introduce a single active at a time and patch-test. And if you're on isotretinoin, skip strong or drying actives like these unless your dermatologist says otherwise - your skin is fragile right now.
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