Selenomethionine

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Product Name: Selenomethionine

Other Names: L-Selenomethionine, SeMet, Seleno-DL-Methionine

CAS No.: 1464-42-2 (DL-form), 3211-76-5 (L-form)

Molecular Formula: C₅H₁₁NO₂Se

Specification: Purity ≥ 98%, available as a crystalline powder, complies with USP and FCC standards

Appearance and Color: White to off-white crystalline powder

Ingredient Information: Selenomethionine is an organic selenium amino acid, typically referring to the L-form (L-Selenomethionine) but available as a racemic DL-mixture, naturally occurring in plants like Brazil nuts and cereals grown in selenium-rich soil, or synthesized by combining selenium with methionine precursors. Composed of carbon, hydrogen, nitrogen, oxygen, and selenium, it integrates into proteins as a methionine analog, providing higher bioavailability and retention than inorganic selenium (e.g., selenite). It is processed into a stable, water-soluble powder (solubility ~100 mg/L at 20°C).

Uses: Widely used in dietary supplements to boost antioxidant activity through glutathione peroxidase, support thyroid hormone metabolism, and enhance immune function, with evidence suggesting cancer risk reduction (e.g., 200 µg/day) but caution for selenosis at high doses. It is also employed in animal nutrition to enrich selenium in meat, eggs, and milk, approved at 0.2 mg/kg feed in the EU, improving livestock health. Additionally, it finds application in research for selenoprotein synthesis studies and in fortified foods as a bioavailable selenium source.