I seem to remember (although I can't remember where from) that the highest recommended for glycolic was 8% for face, 10% for body if it was for regular use, but maybe I am making that up? Also, it doesn't make any sense to transfer those percentages over to other acids with different molecular weights, but maybe that is just a kind of industry standard, IDK.
I might wait, in the hopes that Karen will come out with a gel form
