| Product Name |
L-Selenomethionine |
|---|---|
| CAS No. | 3211-76-5 |
| MF | C5H11NO2Se |
| MW | 196.11 |
| Specification | ≥98.0% (HPLC) |
| Appearance | White to off-white crystalline powder |
| Packing | 1kg/aluminum foil bag, 25kg/drum or customized packaging |
| Applications |
Antioxidant, immune support, anti-aging, nutritional supplement |
L-Selenomethionine is an organic selenium compound, where selenium is bound to methionine. It is the most bioavailable and effective form of selenium used in dietary supplements and functional foods. Selenium is an essential trace mineral, playing a critical role in antioxidant defense, thyroid hormone metabolism, immune regulation, and healthy aging.
Compared with inorganic selenium (such as sodium selenite), L-Selenomethionine has better absorption, higher retention, and lower toxicity, making it the preferred choice in nutraceuticals and pharmaceuticals.
🛡 Potent Antioxidant – protects against oxidative stress and DNA damage
🦠 Immune Support – enhances immune cell activity and resistance to infection
🧬 Anti-Aging Effects – reduces cellular damage and supports longevity
🦋 Thyroid Health – essential for thyroid hormone synthesis and metabolism
❤️ Cardiovascular Support – lowers inflammation and oxidative burden in heart health
Produced under GMP, ISO, and HACCP-certified facilities
High purity ≥98%, pharmaceutical-grade
Low heavy metals & microbiological safety guaranteed
Available in bulk supply with COA, MSDS, TDS
Widely applied in dietary supplements, fortified foods, and clinical nutrition
| Specification | Qualified Testing Result | Actual Testing Result | Test Method |
|---|---|---|---|
| Part 1. Physical & Chemical Analysis | |||
| Appearance | White to off-white crystalline powder | Complied | Visual |
| Odor | Characteristic | Complied | Organoleptic |
| Assay (HPLC) | ≥98.0% | 98.6% | HPLC |
| Loss on Drying | ≤0.5% | 0.11% | USP <731> |
| Residue on Ignition | ≤0.1% | 0.04% | USP <281> |
| Selenium Content | 24.0–26.0% | 25.2% | ICP-MS |
| Part 2. Heavy Metal Analysis & Chemical Control | |||
| Total Heavy Metals | ≤10 ppm | Complied | AAS |
| Lead (Pb) | ≤3 ppm | <0.1 ppm | ICP-MS |
| Arsenic (As) | ≤1 ppm | <0.1 ppm | ICP-MS |
| Cadmium (Cd) | ≤1 ppm | <0.05 ppm | ICP-MS |
| Mercury (Hg) | ≤0.1 ppm | <0.01 ppm | ICP-MS |
| Part 3. Microbiological Analysis & Control | |||
| Total Plate Count (cfu/g) | ≤1,000 | <100 | USP <61> |
| Yeast & Mold (cfu/g) | ≤100 | <10 | USP <61> |
| E. coli | Negative | Negative | USP <62> |
| Salmonella (per 25 g) | Negative | Negative | USP <62> |
Dietary supplements (capsules, tablets, powders)
Functional foods and beverages
Anti-aging and immune health formulas
Thyroid and cardiovascular health products
Q: What is the difference between L-selenomethionine and selenomethionine?
A: There is no chemical difference. “L-selenomethionine” simply specifies the natural, biologically active form. The “L-” prefix denotes the specific molecular structure that your body can recognize and use effectively. Some manufacturers drop the “L-” for simplicity, but high-quality supplements should always contain the L-form.
Q: Is L-selenomethionine natural or synthetic?
A: While it can be synthesized in a lab, the final molecule is identical to the organic form found in foods like Brazil nuts and selenium-enriched yeast. It is the preferred “organic” selenium source in supplements because your body treats it like a natural amino acid, leading to superior absorption and storage compared to inorganic forms like sodium selenite.
Q: How much L-selenomethionine per day?
A: Dosage is based on the elemental selenium it provides.
The recommended daily allowance (RDA) for adults is 55 mcg of elemental selenium.
The safe upper limit (UL) is 400 mcg for adults.
A typical L-selenomethionine supplement providing 200 mcg of elemental selenium is a common and safe daily dose for general antioxidant support.
Always check the supplement label for the amount of elemental selenium and consult your healthcare provider before use, as needs can vary.
1kg/aluminium foil bag, with two plastic bags inside.
Gross Weight: 1.5kg Size: 18cmxH27cm
25kg/fiber drum, with two plastic bags inside.
Gross Weight: 28kg Size: 42cmxH52cm Volume: 0.0625mg/Drum.
DHL / FEDEX / EMS / E-PACKET / BY AIR / BY SEA
1. ≤50kg, Express delivery(DHL /FEDEX) recommended, usually called as DDU service;
2. ≤500kg, Air shipping recommended, usually called as CIF service;
3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;
4. For high value products, please select air shipping and express delivery for safe.
We will contact you within 1 working day, please pay attention to the email with the suffix “forrest@oriherb.com”.
