How long are BHAs/AHAs active after application?

edited January 2015 in Ask the Beauty Brains
Hi all!

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 :-*

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