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Description
The effect of selenium therapy on semen parameters in infertile men with varicocele

Even compounds with strong evidence can cause adverse effects at high doses

A reduced incidence in lung, colorectal, and total cancer was also associated with supplementation with 200 g/day (82) but not with 400 g/day of selenium-enriched yeast (83)

Am J Physiol 2010

Also legally accessible as an FDA-approved drug