Sodium Selenate – Effects, Dosage and Safety
Sodium selenate is an inorganic selenium compound used as a dietary supplement and in medicine to supply the body with the essential trace element selenium.
Things worth knowing about "Sodium Selenate"
Sodium selenate is an inorganic selenium compound used as a dietary supplement and in medicine to supply the body with the essential trace element selenium.
What is Sodium Selenate?
Sodium selenate (chemical formula: Na₂SeO₄) is an inorganic salt of selenium in its highest oxidation state (+6). It belongs to the group of selenium-containing compounds that can supply the body with the vital trace element selenium. Other selenium compounds include sodium selenite (Na₂SeO₃) and organic forms such as selenomethionine. Sodium selenate is used in medicine, nutritional science, animal nutrition, and agriculture.
Biological Functions of Selenium
Selenium is an essential trace element that the human body cannot produce on its own and must obtain through diet. As a key component of selenoproteins, it performs numerous important functions:
- Antioxidant protection: Selenium is a central component of the enzyme glutathione peroxidase, which protects cells from oxidative stress and free radicals.
- Thyroid function: Selenoproteins are involved in the conversion of thyroid hormones (e.g., T4 to T3) and are necessary for normal thyroid function.
- Immune system: Selenium supports the activity of immune cells and contributes to defense against infections.
- Reproduction: Selenium plays a role in sperm formation and male fertility.
- DNA synthesis: Selenoproteins are involved in the repair of DNA damage.
Mechanism of Action of Sodium Selenate
After oral ingestion, sodium selenate is absorbed in the small intestine. In the body, selenate (SeO₄²⁻) is first reduced to selenite (SeO₃²⁻) and then to selenide, which serves as the precursor for the biosynthesis of selenocysteine. Selenocysteine is the biologically active form of selenium and is directly incorporated into selenoproteins. The bioavailability of sodium selenate is considered good, although it can be influenced by other dietary components.
Medical Use and Dietary Supplementation
Sodium selenate is used in the following contexts:
- Selenium deficiency therapy: In cases of confirmed selenium deficiency, sodium selenate can be used for targeted supplementation.
- Parenteral nutrition: In clinical nutritional medicine, sodium selenate is frequently used as a selenium source in intravenous nutrition solutions.
- Dietary supplements: Sodium selenate is available as an active ingredient in various selenium preparations.
- Research: In cancer research and immunology, the effects of sodium selenate on cellular processes are being investigated.
Recommended Daily Intake
The recommended daily selenium intake varies by age and sex. The World Health Organization (WHO) indicates a requirement of approximately 26–34 µg/day for adults. In Germany, the German Nutrition Society (DGE) recommends a daily intake of 60–70 micrograms (µg) for adults. At therapeutic doses, higher amounts may be used under medical supervision.
Selenium Deficiency
Selenium deficiency can have various causes, including selenium-poor soils (particularly in certain regions of Europe and China), unbalanced diets, malabsorption syndromes, or chronic kidney disease. Typical symptoms of selenium deficiency include:
- Muscle weakness and muscle pain
- Thyroid dysfunction
- Impaired immune function
- Keshan disease (a selenium deficiency-related heart condition, mainly known in China)
- Kashin-Beck disease (a joint disease associated with chronic selenium deficiency)
Toxicity and Safety
Selenium has a comparatively narrow therapeutic range. The tolerable upper intake level (UL) set by the European Food Safety Authority (EFSA) for adults is 300 µg/day. Chronic overdose leads to selenosis, the symptoms of which include:
- Garlic-like breath odor
- Hair loss and brittle nails
- Gastrointestinal complaints
- Nerve damage (polyneuropathy)
- In severe cases: liver and kidney damage
Sodium selenate should therefore only be taken when there is a confirmed need and at recommended doses. Medical consultation before taking selenium supplements is strongly advised.
Interactions
The following interactions may occur when taking sodium selenate:
- Vitamin C: High doses of vitamin C may reduce the bioavailability of selenate by reducing it to selenite.
- Vitamin E: Acts synergistically with selenium in antioxidant defense.
- Heavy metals: Mercury and other heavy metals can interfere with selenium absorption.
- Statins and other medications: Interactions with certain drugs are possible; consultation with a physician is recommended.
References
- European Food Safety Authority (EFSA): Scientific Opinion on Dietary Reference Values for selenium. EFSA Journal, 2014;12(10):3846. doi:10.2903/j.efsa.2014.3846
- Rayman MP: Selenium and human health. The Lancet, 2012;379(9822):1256–1268. doi:10.1016/S0140-6736(11)61452-9
- World Health Organization (WHO): Trace Elements in Human Nutrition and Health. Geneva: WHO, 1996.
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