Some people - because of media hype - take several hundred mcg of selenium a day, but Dr. Ronald Roth usually advises his own patients against higher amounts - not so much because of selenium toxicity, but because of its antagonism to chromium, magnesium, zinc and other nutritional factors. Long-term excessive intake of selenium increases the potential risk of triggering shingles, or developing trabecular osteoporosis, cystadenoma, an enlarged prostate, reduced glucose tolerance diabetes, neurological disturbances, or other negative consequences... Full Text