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Why it's flagged
Same logic as with AHAs: BHA and retinol stack irritation on an already fragile skin barrier.
What Haru suggests
Give each its own evening, never both at once.
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.