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Regarding Aluminum;
Aluminum is wonderfully important and prevalent; the most common metal (as % of amount on earth) and the 2nd most used (to iron).
It has not been shown to have any use by living organisms. However, it has also not been shown to be dangerous. It was linked to Alzheimer's, then that link was debunked. There are a very small (unconfirmed%) who are allergic on a contact basis. Aluminum also may function as a neurotoxin, although that research did not indicate the required levels the basis for toxicity beyond that it appears to change blood-brain barrier. Certainly, as Will quoted, if you already have liver problems and are treated with aluminum contaiminated solutions, it could pose a problem.
That said, aluminum is everywhere. Everyone has had signifcant exposure. I would guess that you consume significantly more aluminum in each antacid tablet than in many flu shots. Or when you used antipersperant. And you were exposed the last time you painted wood, consumed anything from a can, cooked anything in an aluminum pan. Or were near any construction. And even then, the aluminum won't probably won't hurt you, unless you happen to be a very select percentage of the population, and then it might have a chance of being harmful.
I'm not about to search for various sources, I'm 100% confident that if you care enough you'll easily be able to find them. I've done research on aluminum in the past. Using "flu shots have aluminum and aluminum is toxic" is a terribly weak argument.
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