I read about using diaper rash ointment for under arm protection in the newspaper last week. I tried it that very day-- it's the best antiperspirant/deodorant I have ever used. It's a wonderful alternative to the usual stuff.
Diaper Rash Ointment
I finally found a cure for the bacteria that causes really strong and offensive armpit odor. Desitin cream applied liberally and left on for at least 24 hours has completely eliminated bad armpit odor. This is the same product that many use to help with diaper rash on babies.