Beta-carotene, selenium and folic acid, are essential and we need them (in a certain balance), but if taken at much higher levels as some supplement manufacturers suggest, these three supplements have now been proven to increase the risk of developing a host of cancers.
We have a window into less than half of the biology of what these nutrients, that we call an antioxidant or an essential mineral, are doing. True biology turns out to be more complex than that. The effects of these supplements are certainly not limited to the label we give them. Sometimes the unintended effects include increased cancer risk.
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