ForumsThe RegimenThe RegimenAha Shelf Life Once... Notifications Clear all Unless you have severe, widespread, and scarring acne, The Regimen is normally my suggestion for the most effective acne treatment.My suggested acne treatment Learn The Regimen → Learn The Regimen → Aha Shelf Life Once Opened? Some Green Tea MemberMember0(@somegreentea) Posted : 08/03/2014 11:13 pm Is there a depreciated shelf life for AHA once its opened, or is the expiration date on the crimp what matters for AHA? Quote Like Moonlight MemberMember31(@like-moonlight) Posted : 08/04/2014 3:19 pm The date up on the crimp is what you should be paying attention to. Usually 5 to 6 months Quote