Selenium
Selenium is a trace element essential in small amounts, but can be toxic at high levels. Humans and animals require selenium for the function of a number of selenium-dependent enzymes, also known as selenoproteins.
During selenoprotein synthesis, selenocysteine is incorporated into a very specific location in the amino acid sequence in order to form a functional protein.
Selenium supplements are available in several forms. Sodium selenite and sodium selenate are inorganic forms of selenium.
Selenate is almost completely absorbed, but a significant amount is excreted in the urine before it can be incorporated into proteins.
Selenite is only about 50% absorbed but is better retained than selenate once it is absorbed.
Selenomethionine, an organic form of selenium that occurs naturally in foods, is about 90% absorbed. Selenomethionine and selenium-enriched yeast, which mainly supply selenomethionine, are also available as supplements.
The average American diet is estimated to provide about 100 mcg/day of selenium, above the current RDA (55 mcg/day) and appears sufficient to maximize plasma and cellular glutathione peroxidase activity. Eating a varied diet and taking a daily multivitamin supplement should provide sufficient selenium for most people.
Supplements with this ingredient:PCT Revolution Black (Post Cycle Support)
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