Aluminum is a neurotoxin, and is found in most antiperspirants. It has been linked to Alzheimer’s Disease, respiratory illnesses, reduced renal function, and DNA damage.
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In 1993, the World Health Organization said, "There is a suspected link between Alzheimer's disease and the toxicity of aluminum."
The Agency for Toxic Substances and & Disease Registry reports that "Exposure to high levels of aluminum may result in respiratory and neurological problems."
What's more, "antiperspirants are designed to be absorbed"; the aluminum and many other chemicals are taken into the body and may affect the endocrine and lymphatic systems, as well as being a potential risk factor in breast cancer.