BP= Benzoyl Peroxide
AHA= alpha hydroxy acid. Glycolic acid is one type of alpha hydroxy acid, derived from sugar cane.
BHA= beta hydroxy acid. Somewhat similar to AHA in that it's an exfoliant. Salicylic acid is one kind of BHA, also considered by some doctors to be an anti-inflammatory & anti-oxidant.
SA=Salicylic acid, described above.
B5= Pantothenic acid, one of the "B" vitamins.
[This message has been edited by sedulous (edited 08-15-2003).]