An essential dietary mineral.

GoldBamboo

... Selenium is a trace mineral usually obtained from the diet. Several large, well-controlled human studies have linked selenium supplementation to a small decrease in the occurrence of prostate, lung, and colorectal cancers. In addition, the progression of these cancers in certain individuals was delayed or even halted. However, results were erratic and selenium appears to have little or no effectiveness for preventing or controlling other cancers including breast cancer, leukemia, lymphoma, and melanoma. In one large human study, selenium supplementation was actually associated with an increased risk of developing certain skin cancers. ...
Drug Digest - more...

Selenomethionine: chemical structure Selenomethionine is an amino acid ...
Wikipedia - [full article]

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