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Nutritional Selenium Supplements: Product Types, Quality, and Safety

Department of Chemistry and Biochemistry, University of California San Diego, and, Biological Trace Element Research Institute, San Diego, California

Address reprint requests to: Gerhard N. Schrauzer, PhD, CNS, FACN, Biological Trace Element Research Institute, 11526 Sorrento Valley Rd., Ste. A., San Diego, CA 92121.

ABSTRACT

Selenium supplements contain selenium in different chemical forms. In the majority of supplements, the selenium is present as selenomethionine. However, in multivitamin preparations, infant formulas, protein mixes, weight-loss products and animal feed, sodium selenite and sodium selenate are predominantly used. In some products, selenium is present in protein- or amino acid chelated forms; in still others, the form of selenium is not disclosed. Current evidence favors selenomethionine over the other forms of selenium. Extradietary supplementation of selenium at the dosage of 200 micrograms per day is generally considered safe and adequate for an adult of average weight subsisting on the typical American diet.

Key words: selenium, selenomethionine, selenium yeast, sodium selenite, sodium selenate, dietary supplements

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