I'm wondering how long AHAs and BHAs work their exfoliating magic after being applied topically. As they require a specific pH for exfoliation to occur, shoudn't they be inactivated fairly quickly after skin readjusts to its physiological pH? What happens when I layer a moisturizer over, say, an AHA/BHA toner, will this influence the efficacy?
I'd love to hear from you guys, because google didn't have the answer to this one ;-)
Greetings from Germany :-*