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Their ads say that AO spray makes your sweat smell less bad and it helps clear up acne. I've had zits since I hit puberty and a product that cuts down on the amount of caustic chemicals I need to rub all over my body would be great. I also commute to work by bicycl I'm 100+ degree Fahrenheit weather, and my office has no shower, so if AO actually cuts my BO then it might be a good investment.
I'm not a specialist in acne, but it's basically an infection and I would want to see some hard evidence before believing that some other extra friendly bacteria will make it better. As to sweat, I don't know, it's different for different people, but since you can't shower or the whole thing washes away, I have my doubts...
Anyway, if you don't want to be a guinea pig, find some people who have tried it (not me). My uninformed guess is that it's diluted bullshit and I wouldn't bother.