https://pubmed.ncbi.nlm.nih.gov/15725565/ Salicylic acid at ph 7 retains its keratolytic function as similar preparations at pH
3.3. While, again, not at
ph 9-10 of soap, the expected free acid levels are practically equivalent so could be
directly relatable. Important to note that these only apply to BHAs and not AHAs.
@RDchemist15 I’ll second that thanks. I always formulated the beta-hydroxyacid desquamators to pH 5 just to prevent the scorching effects on skin at the lower pH, but falsely believed - not any more thanks - that efficacy was diminished as it is for the glycolic acid peels. The 2% SalAc product at pH 5 - 6 is safer with time-release function: a win-win. Also easier to solubilize I might add.