L-Selenomethionine
L-Selenomethionine Manufacturer | Premier Organic Selenium Source (CAS: 3211-76-5) Headline: L-Selenomethionine Powder Manufacturer | Highly Bioavailable Organic Selenium (Assay ≥ 99%) Sub-info: Selenium Content ~40% | USP/EP Standard | Non-GMO & Fermentation/Chemical Synthesis Source. USP: • Superior Bioavailability: 2x higher absorption rate compared to inorganic sodium selenite. • Direct Incorporation: Incorporates directly into body proteins in place of methionine. • Supply Chain Safety: Ready Stock in CN | ISO 9001/22000 Certified Facility.
Introduction
L-Selenomethionine is the primary naturally occurring food form of selenium. It is an amino acid derivative where the sulfur atom in methionine is replaced by a selenium atom.
Unlike inorganic selenium (e.g., sodium selenite), which acts merely as a cofactor, L-Selenomethionine is recognized by the human body as an amino acid. This unique property allows it to be stored in the body's "selenium pool" (incorporated into muscle tissues), creating a reserve that can be utilized during times of high oxidative stress. We offer high-purity L-Selenomethionine (Pure Powder, >98%) designed for premium dietary supplements, functional foods, and pharmaceutical formulations requiring precise selenium dosage.
Category：
Keywords：
selenium
l-selenomethionine
Functions
1.Powerful Antioxidant Defense (Glutathione Peroxidase)
Selenium is the essential component of Glutathione Peroxidase (GSH-Px). L-Selenomethionine effectively raises GSH-Px levels, neutralizing harmful free radicals and protecting cells from oxidative damage.
2.Thyroid Health Support
Selenium is critical for the conversion of the thyroid hormone T4 (thyroxine) to its active form, L-Selenomethionine ensures adequate selenium levels to support optimal thyroid function and metabolic health.
3.Immune System Enhancement
It boosts the proliferation of activated T-cells. Adequate selenium status achieved through L-Selenomethionine supplementation is linked to improved antiviral defense and immune response.
Applications
1.Dietary Supplements
• Forms: Hard capsules, Tablets, Multivitamins.
• Advantage: Used as the gold standard for "Organic Selenium" claims. It does not cause the gastrointestinal irritation often associated with inorganic selenium.
2.Functional Food Fortification
• Uses: Nutritional bars, protein powders, and meal replacements.
• Advantage: Stable under food processing conditions and neutral in taste compared to yeast-based selenium.
3.Animal Nutrition (Premium Feeds)
• Uses: High-end pet food and aquaculture.
• Advantage: Improves meat quality and reproductive performance in livestock due to higher tissue retention.
Flow Chart
Synthesized under strict Inert Atmosphere to prevent Oxidation
1.Raw Material Prep: High-purity Methionine precursor + Selenium source.
2.Reaction: Controlled synthesis/Fermentation process.
3.Purification: Crystallization to remove inorganic selenium residues.
4.Filtration & Washing: Ensuring removal of solvents.
5.Drying: Vacuum drying at low temperatures.
6.Sieving: Passing through 80 Mesh.
7.Blending: (Optional dilution if requested, e.g., 1% Trituration).
8.QC Testing: Se Content & Purity Assay.
9.Packaging: Vacuum-sealed aluminum foil bags.
Quality Standard of Lactoferrin
Product: L-Selenomethionine (Pure Substance)
| Item | Specification | Result / Standard |
| Appearance | White to off-white crystalline powder | Conforms |
| Assay (Titration) | 98.0% ~ 102.0% | 99.5% |
| Selenium Content (Se) | 39.0% ~ 41.0% | 40.2% |
| Specific Rotation | +16.0° to +19.0° | +18.2° |
| Loss on Drying | ≤ 0.5% | 0.2% |
| Residue on Ignition | ≤ 0.2% | 0.08% |
| Heavy Metals (Pb, As) | ≤ 10 ppm | Conforms |
| Inorganic Selenium | ≤ 1.0% | Not Detected |
| Microbiology | Total Plate Count < 1000 cfu/g | Conforms |
Method of Analysis of Lactoferrin
HPLC / Inductively Coupled Plasma Mass Spectrometry (ICP-MS)
• Purity: We use HPLC to confirm the chiral purity (L-isomer) and ensure it is free from D-Selenomethionine.
• Selenium Content: ICP-MS is utilized to precisely measure total Selenium content, ensuring it meets the theoretical range of ~40%.
Reference Chromatogram of Lactoferrin Reference Substance
(Visual Placeholder: Chiral HPLC Chromatogram)
The chromatogram demonstrates a single sharp peak at the retention time of L-Selenomethionine, confirming >99% Enantiomeric Purity. No peaks for inorganic selenium (selenite/selenate) are observed, validating the "Organic" claim.
Stability and Safety
Stability Studies
• Shelf Life: 24 months (2 Years).
• Conditions: Stored in tight, light-resistant containers at controlled room temperature (25°C).
• Data: Stability testing at 0, 12, and 24 months shows Selenium Content and Specific Rotation remain stable. The product is sensitive to moisture and light; our vacuum packaging ensures integrity.
Safety & Handling (MSDS Summary)
• Toxicity: Toxic if swallowed or inhaled. (Note: Pure L-Selenomethionine is a concentrated selenium compound).
• Classification: UN 3283 (Selenium compound, solid, n.o.s.).
• Handling: STRICTLY require dust mask (N95/P2), gloves, and safety goggles. processing should be done in a well-ventilated area or fume hood to prevent dust inhalation.
• Storage: Keep locked up. Store away from strong oxidizing agents.
Customer Comments
Product Manager, Supplement Brand (USA)
2026.03.16
★★★★☆
Senior Formulator, Contract Manufacturer (Canada)
2026.03.16
★★★★☆
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FAQ
What is the difference between L-Selenomethionine and Selenium Yeast?
L-Selenomethionine is a pure, single-chemical entity (chemically synthesized or fermentation-derived) with a known, precise structure and >99% purity. Selenium Yeast is a fermentation product where selenium replaces sulfur in various proteins; it is a mixture. L-SeMet allows for more precise dosing and is allergen-free (no yeast).
Is your L-Selenomethionine synthetic or natural?
We offer bio-fermentation derived L-Selenomethionine which mimics the exact bio-identical structure found in nature. It is vegan-friendly and free from animal products.
What is the recommended dosage?
Selenium is a trace mineral. Typical finished product dosages range from 55 mcg to 200 mcg per day. Note: Pure L-Selenomethionine is highly concentrated (~400,000 ppm Se); precise dilution (trituration) is required during manufacturing.
References
1.Rayman, M. P. (2000). The importance of selenium to human health. The Lancet.
2.Schrauzer, G. N. (2000). Selenomethionine: a review of its nutritional significance, metabolism and toxicity. The Journal of Nutrition.
3.Burk, R. F., & Hill, K. E. (2015). Regulation of Selenium Metabolism and Transport. Annual Review of Nutrition.
4.FDA. (2022). Code of Federal Regulations Title 21 - Selenium.
5.EFSA Panel on Dietetic Products. (2009). Scientific Opinion on L-Selenomethionine as a source of selenium. EFSA Journal.
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