From Dr. Joseph Mercola:
Most people use antiperspirant daily with good intentions, but using antiperspirant is a good way to increase your chances of getting Alzheimer’s disease, as it is one of the common sources of aluminum. The aluminum in antiperspirant is absorbed by the body and wreaks havoc in the brain, where it contributes to the growing numbers of people coming down with Alzheimer’s disease.
I stopped using antiperspirant nearly 20 years ago. I use soap and water instead, and it works splendidly. I even stopped getting underarm stains on my shirts, as it appears the stains were due to an interaction with the antiperspirant and my sweat, not the sweat alone.
Deodorants aren't as bad as antiperspirants, but I would also avoid using them unless you find a natural, aluminum-free variety made from some form of baking soda.
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