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Glycolic Acid
Smallest-molecular AHA; exfoliates the surface stratum corneum for smoother texture and brighter tone. 4-10% in leave-on products.
With Salicylic Acid · EXFOLIATION_STACKHIGH
Two exfoliating acids in one session is redundant and risky; alternate or space across days.
With Lactic Acid · EXFOLIATION_STACKHIGH
Same-night AHA stacking multiplies irritation; alternate nights.