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Why it's flagged
L-AA vitamin C is unstable at a pH close to active retinol; combining them can neutralize part of their efficacy and irritate skin.
What Haru suggests
Vitamin C in the morning (antioxidant + protection), retinol at night. Simple, effective, zero conflict.
How settled this is
Commonly advisedA common recommendation rather than a strict rule — adjust it to how your skin actually responds.
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.