How long are BHAs/AHAs active after application?

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 :-*


  • That's a great question! Let me see what I can find out. 
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