An alpha-hydroxy acid that exfoliates for a smoother-looking surface; usually evening.
Low-pH exfoliating acids are commonly kept apart from copper peptides, since the acidic environment is thought to disturb the copper complex. Use the acid on its own evening and the peptide another time.
Some keep peptides away from low-pH acids as a precaution; the concern is theoretical for finished products.
The pH concern with peptides and acids is often repeated but not well-established; separate if your skin prefers.
Precautionary rather than established — many routines combine peptides and acids without issue.
Both are low-pH actives; layering can raise the chance of stinging for some skin. Introduce slowly or alternate.
Layering a retinoid with an exfoliating acid raises the chance of visible irritation for many people; alternating on different nights is common.
Combining exfoliating acids increases total exfoliation and the chance of over-doing it — use sparingly and not every day.
Two strong actives together can be drying or irritating for some; introduce slowly.
Generally fine; niacinamide is well tolerated alongside exfoliating acids.
No specific interaction noted — generally fine to layer in a cosmetic routine. Patch-test new combinations.
No specific interaction noted — generally fine to layer in a cosmetic routine. Patch-test new combinations.
No specific interaction noted — generally fine to layer in a cosmetic routine. Patch-test new combinations.
No specific interaction noted — generally fine to layer in a cosmetic routine. Patch-test new combinations.
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