Selenium is a trace element that has antioxidant properties and is claimed to be an antimemory-loss agent, but it has not been tested rigorously in people who have memory loss. There are other elements—magnesium and zinc in particular—that are necessary for normal brain function in small quantities, or traces. Until more solid evidence is forthcoming, and given the potential toxicity of these metallic elements and compounds, I don't recommend taking supplements of any trace metals. The amounts of these various substances present naturally in foods (and most multivitamin tablets) easily reach the FDA minimum daily requirement guidelines, so nutritional deficiency states are extremely rare.
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