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Why it's flagged
Benzoyl peroxide oxidizes retinol and significantly reduces its efficacy, on top of irritating skin if combined.
What Haru suggests
Use benzoyl peroxide in the morning and keep retinol for the evening, spaced by a few hours — or alternate days.
How settled this is
Well-establishedWidely agreed on in cosmetic science; worth following.
Based on general cosmetic consensus — not on your products' specific concentrations, which aren't disclosed and are never inferred from the ingredient list order.
These recommendations are general and don't replace advice from a dermatologist, especially for sensitive skin or a prescribed treatment.