Question: what are aha and bha exfoliants?
Answer: AHAs (alpha hydroxy acids, i.e. glycolic and lactic acids) and BHA (beta hydroxy/salicylic acid) both work to 'unglue' the bonds holding dull, dead skin on the surface. ... To work effectively, AHA and BHA exfoliants must be formulated within a narrow pH range, between 3 and 4.