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Vitamin A is the precursor for the pigments in the rod and cone cells of the eyes that detect light. With it you can see, a deficiency can cause blindness.

However too much vitamin A can be toxic and it builds up in fat. To prevent toxicity supplements do not actually contain vitamin A, instead they contain Beta Carotene a precursor of vitamin A that is nontoxic and that the body converts as it needs vitamin A.

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