L-Selenium-methylselenocysteine and L-selenomethionine are the only two selenium-containing amino acids in nature, and are also
known as the third-generation selenium-enriched varieties.
L-selenium-methyl-selenocysteine is a selenomethylated derivative of L-selenocysteine, the 21st essential amino acid. It is widely found in Astragalus, garlic, onion, cabbage and other plants as well as selenium-rich yeast. It has the advantages of clear chemical structure, low toxicity, high bioavailability and good selenium supplementation effect.