Aluminum is the third most common element on earth, but is always found in chemical combination in nature. Our exposure to free aluminum or aluminum salts results from numerous industrial and household uses of the metal. It is not considered an essential element in biological systems and is found in only very small concentrations, or not at all, in populations of non-industrialized countries. For the most part, it can be considered a toxin whenever it is present in the body. Like so many of the toxic metals we have discussed so far, no one knows what constitutes a safe level.
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