The aluminum/alzheimer's link isn't very solid at all, and the websites I'm reading talk about other sources of aluminum (cans, cookware, water, food packaging, antacids) don't mention antiperspirant/deoderant. Heck, if copper cookware was more affordable, I'd bet you'd hear more about copper poisoning/allergies than you'd ever hear about the suggested but difficult to study much less prove idea that aluminum has any kind of causal relationship to Alzheimers. And if they do prove it, you'll have a lot more to do to eliminate your aluminum intake (avg 30-50mg/day, I just read) than discontinue using an Aluminum-salt-based antiperspirant.