We can provide you with high-purity, highly stable anhydrous sodium selenite powder-a tetravalent selenium source existing in the form of selenite anions (SeO₃²⁻), the most widely used and thoroughly researched selenium supplement raw material in the global fields of dietary supplements, foods for special medical purposes, animal feed, and agricultural selenium fortification.
Anhydrous sodium selenite is the most mature selenium source choice in the global industry. It exists as a white crystalline powder, with selenium stably existing in the +4 valent selenite form. It has excellent water solubility, enabling rapid and uniform dispersion in premixes and liquid formulations. Compared to sodium selenate (hexavalent selenium), sodium selenite has a longer application history, more comprehensive toxicological and pharmacokinetic data, and a lower cost advantage, making it the most mainstream selenium supplement form in the global multivitamin and animal feed industries.
Product Characteristics
Appearance: White crystalline fine powder, odorless, stable in dry air.
Solubility: Extremely soluble in water, dissolves rapidly, insoluble in ethanol.
Key Indicators: Selenium (Se) content is typically between 44% and 46%
Physical Properties: Good flowability, somewhat hygroscopic, may deliquesce under high humidity conditions.
Stability: Relatively stable to heat, but should avoid contact with strong reducing agents, strong acids, and flammable substances.
COA
|
Item |
Specification |
Result |
|
Appearance |
White to off-white crystalline powder |
Conforms |
|
Identification (Selenite) |
Positive reaction |
Conforms |
|
Identification (Sodium) |
Positive reaction |
Conforms |
|
Assay (as Na₂SeO₃) |
98.0% – 101.0% |
99.3% |
|
Selenium (Se) Content |
45.0% – 46.5% |
45.8% |
|
Loss on Drying |
≤1.0% |
0.3% |
|
pH (5% solution) |
8.5 – 10.0 |
9.2 |
Benefits of Sodium Selenite anhydrous powder
Provides tetravalent selenium (Se⁴⁺) source: The selenium in sodium selenite is in the +4 valence state, which is lower than the +6 valence in sodium selenate, resulting in stronger chemical reducing power.
More direct in vivo conversion pathway: Sodium selenite is reduced to hydrogen selenide (H₂Se) via thioredoxin reductase and other pathways requiring only two reduction steps, while sodium selenate requires first being reduced to selenite (an additional step) before further conversion.
Higher glutathione consumption: Sodium selenite requires glutathione (GSH) as a reducing equivalent during in vivo reduction, while sodium selenate has a relatively lower dependence on the glutathione system.
No selenomethionine storage form: After conversion, sodium selenite is mainly incorporated into selenoproteins as selenocysteine, unlike sodium selenate (or selenomethionine), which non-specifically replaces methionine for storage in tissues such as muscle.
Application Fields
Dietary Supplements
Multivitamin/mineral tablets, capsules, liquids, and trace mineral drops.
Pharmaceuticals
Component in parenteral nutrition solutions and specialized medical products.
Animal Feed
Trace mineral premixes for poultry, swine, ruminants, aquaculture.
Glass Manufacturing
Produces pink to red coloration in glass.
Food Fortification
Enrichment of infant formulas, meal replacements, and specialized nutritional products where selenium levels are insufficient.
Laboratory Reagent
Used in chemical synthesis, research applications, and as a selenium source.
Production Process
Product Quality Advantages
Highest Selenium Concentration: 44.0%–46.0% selenium content, the highest among all common selenium supplement forms, minimizing inclusion rates and reducing raw material costs.
Anhydrous Form Stability: No water of hydration (loss on drying ≤1.0%), preventing weight variability, caking, or efflorescence during storage and transport.
Excellent Water Solubility: Freely soluble in water without heating, producing clear solutions suitable for liquid applications without sedimentation or turbidity.
Low Selenate Impurity: Selenate (Se⁶⁺) content controlled to ≤1.5%, ensuring the product is predominantly the intended selenite form with consistent oxidation state.
Low Anion Impurities: Chloride and sulfate each ≤0.1%, minimizing unwanted counterions that could interfere with sensitive formulations.
Good Flowability: Fine crystalline powder with consistent particle size (≥95% pass 80 mesh), suitable for high-speed encapsulation, tableting, and powder blending.
Export Certificates
Professional ODM/OEM Services
We deliver end-to-end ODM/OEM solutions for plant extracts, transforming your concepts into market-ready products through integrated expertise and in-house production.
① Cooperation Models
OEM: Faithfully reproduce your formula with guaranteed integrity and batch-to-batch consistency.
ODM: From concept to launch, we provide complete solutions including formulation, development, and compliant manufacturing.
② Key Process
Analysis & Design: Customized solutions based on your requirements
Prototyping: Sample development using advanced extraction technologies
Production: Certified manufacturing with rigorous quality control
FAQ
Q: What is the difference between sodium selenite and sodium selenate?
A: Sodium selenite (Na₂SeO₃) contains selenium in the tetravalent (Se⁴⁺) state, while sodium selenate (Na₂SeO₄) contains selenium in the hexavalent (Se⁶⁺) state. Selenite is more reduced and has different solubility, stability, and absorption characteristics. Selenite is generally considered more reactive and has higher acute toxicity at equivalent selenium doses, but both are approved for nutritional use.
Q: Why is the anhydrous form preferred over the pentahydrate form?
A: The anhydrous form contains no water of hydration, providing higher selenium concentration per gram (45% vs. approximately 28% for the pentahydrate). This allows for lower inclusion rates, better flow properties, and more stable selenium content without weight variability from hydration changes.
Q: Is Sodium Selenite anhydrous powder non-GMO?
A: Yes. As an inorganic mineral salt, it contains no genetically modified organisms.
Q: Do you provide COA and samples?
A: Yes. A batch-specific COA is provided with each shipment. Free samples are available for quality evaluation upon request.
Q: Do you offer private labeling services?
A: Yes, we provide comprehensive private labeling and OEM services, including custom packaging solutions to support your brand development.
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