http://www.worldwidehealthcenter.net/articles-329.html
Methylselenocysteine: The Super Selenium 27th Oct 2004 by James South, M.A. Selenium is an essential trace mineral, with a recently set RDA (Recommended Dietary Allowance) of 55 mcg.1 Selenium is known to be essential to activate various key enzymes, such as the antioxidant glutathione peroxidase, the metabolic enzyme thioredoxin reductase, and the thyroid-hormone-activating enzyme iodothyronine deiodinase.2 Although selenium is essential for life and health, it is also a potentially toxic mineral. Selenium expert Dr. R. Passwater notes ââ¦organic forms of selenium [such as selenomethionine] are toxic at levels in the vicinity of 3,500 micrograms (3.5 milligrams) daily. Inorganic forms of selenium [such as sodium selenite/selenate] may be toxic at one-third that level.â3 Passwater notes, however, that many Japanese average 600 mcg daily from their diet, and Greenlanders may ingest as much as 1,300 mcg daily, without apparent ill effects.3
