Hermetica Superfood Encyclopedia
Legacy index-continuity record: the score and narrative are provisional and must not be represented as validated or human-approved.
Review flags: AWAITING_SEMANTIC_VALIDATION
Selenomethionine is an organic selenium compound that serves as the primary bioavailable form of selenium in supplements and food sources. It functions as a precursor to selenocysteine, enabling the synthesis of critical antioxidant enzymes like glutathione peroxidase that protect cells from oxidative damage.
Reported Benefits (Provisional)
Origin & History
Selenomethionine is a naturally occurring amino acid that contains selenium. It is found in foods like Brazil nuts, grains, and legumes, and is often used in dietary supplements to ensure adequate selenium intake.
Research Narrative (Provisional)
Research indicates that selenomethionine is an effective form of selenium supplementation. Randomized controlled trials (RCTs) have shown its efficacy in improving antioxidant status and supporting thyroid function.
Preparation & Dosage
Dosage guidance is withheld because the publication gate has not recorded adequate support for this profile.
Nutritional Profile
Selenomethionine is a selenium-containing amino acid and the primary organic form of selenium found in foods and supplements. It is not a whole food but a specific bioactive compound with the following profile: Selenium content: approximately 39.5% selenium by molecular weight (~400 mcg selenium per 1000 mcg selenomethionine). As an amino acid derivative, it contains a methionine backbone (carbon, hydrogen, nitrogen, oxygen, sulfur) with selenium substituted for sulfur. Macronutrient contribution is negligible at supplemental doses (typical doses 50–400 mcg/day). Micronutrient delivery: primary micronutrient delivered is selenium, with each 200 mcg supplement dose providing approximately 79–80 mcg elemental selenium, meeting or exceeding the adult RDA of 55 mcg/day. Bioactive compounds: selenomethionine itself serves as a substrate for selenoprotein synthesis, including glutathione peroxidase (GPx) and thioredoxin reductase. Bioavailability: highly bioavailable at approximately 90–95% absorption efficiency in the gastrointestinal tract, significantly superior to inorganic forms such as selenite (~50%) or selenate (~60%). It is absorbed via methionine transport pathways in the small intestine and can be non-specifically incorporated into body proteins as a selenium reserve. No significant fiber, complex carbohydrate, or fat content. Protein contribution: minimal at supplemental doses.
Reported Mechanism (Provisional)
Selenomethionine is incorporated into proteins in place of methionine, creating a selenium pool for selenocysteine synthesis. Selenocysteine is then incorporated into selenoproteins including glutathione peroxidase, thioredoxin reductase, and iodothyronine deiodinases. These selenoenzymes catalyze antioxidant reactions and thyroid hormone metabolism through selenium's role as a cofactor in the enzyme active sites.
Clinical Narrative (Provisional)
Human studies demonstrate selenomethionine achieves 90% bioavailability compared to 50% for sodium selenite. A 12-week randomized trial (n=69) showed 200 mcg daily selenomethionine increased plasma selenium levels by 65% and enhanced glutathione peroxidase activity by 40%. Clinical evidence supports thyroid function improvements, though most studies are observational rather than controlled trials. The research consistently favors selenomethionine over inorganic selenium forms for bioavailability and tissue retention.
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