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Balanced Equine



Sel-Plex organic 0.2% Selenium 450 g

450 g Sel-Plex (0.2% organic selenium yeast): 0.5 grams = 1 mg selenium The most economical way to supplement selenium with a premium natural source, Sel-Plex. Just like vitamin E, selenium is antioxidant which plays a role in protecting cell structures and cell membranes from the effects of ...Read more
AUD23.00 each

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450 g Sel-Plex (0.2% organic selenium yeast): 0.5 grams = 1 mg selenium

The most economical way to supplement selenium with a premium natural source, Sel-Plex.

Just like vitamin E, selenium is antioxidant which plays a role in protecting cell structures and cell membranes from the effects of oxygen free radicals produced during energy generation and therefore  important for tissues with high aerobic metabolism activity like the brain/nervous system, heart, skeletal muscles and rapidly growing tissues. 

Sel-Plex is considered to be the best quality form of organic selenium yeast, 0.2% (2000 mg/kg) selenium yeast. 

Dr Eleanor Kellon VMD "Whole blood selenium is the preferred test, since it measures both selenium in the plasma and selenium inside red blood cells. With marginal intakes of selenium, the red cell levels will drop first, so serum or plasma testing may show adequate levels when total body selenium is actually borderline or low."'

More information about supplementing selenium:
Selenium Paranoia by Dr Kellon:

This product is contraindicated for use when selenium intake from pasture is high or selenium is provided by other means (such as top dressing, vaccine, pellets or selenium drenches) if blood selenium levels at treatment are high. Users can determine selenium status by consulting their veterinarian.

Sel-Plex is a nutritional supplement product for inclusion in horse's feed. Product has no therapeutic effect and is designed to be administered in a feed for voluntary ingestion for horses.

Horse consumption only.

For orders outside of Australia, please email This email address is being protected from spambots. You need JavaScript enabled to view it. for product prices - tax (GST) and shipping costs.

Selenium (Se) is an essential component of selenium dependent glutathione peroxidase, an enzyme which aids in detoxification of lipo- and hydrogen peroxides that are toxic to cell membranes. Selenium also plays a role in the control of thyroid hormone metabolism.

For a more detailed discussion of oxygen free radicals and the damage they do:  http://www.exrx.net/Nutrition/Antioxidants/Introduction.html 

Some background information about soils may be helpful. Generally speaking, acidic and neutral soils, especially very acidic soils inhibit selenium uptake by plants. Acidic soils are the most common. Alkaline soils are more likely to have adequate selenium levels. A soil test will test pH, the lower the pH number the higher the acidity, 7 is neutral and the higher the number the more alkaline the soil.

"The chemical form of selenium in soil is largely controlled by the redox potential and soil pH. Selenate is the maior form present in well aerated alkaline soils: whereas. selenite predominates in acid and neutral soils. The selenite form however is adsorbed to clays and hydrous Fe oxides and is generally unavailable for plant uptake."
Mayland HF, Gough LP and Stewart KC. Selenium mobility in soils and its absorption, translocation, and metabolism in plants

The NRC (National Research Council) recommendation is 0.1 mg/kg DM (NRC 2007 Nutrient Requirements of Horses, page 96). "However Janicki et al. (2001) found greater influenza antibodies in foals from mares receiving 3 mg Se/day as compared to 1 mg Se/day suggesting that selenium intake necessary for optimum immune function could be greater than that needed to prevent classical deficiency symptoms."

Janicki et al. (2001) The effect of dietary selenium source and level on broodmares and their foals

Severe selenium deficiency causes white muscle disease in foals. Less dramatic deficiencies have a negative impact on immunity, lead to increased red blood cell fragility and reduced antioxidant protection to muscle. Horses with borderline levels are most likely having problems when being worked.

Ishii et al (2002) Selenium is vital for preventing retained placentas:
Effects of vitamin E and selenium administration on pregnant, heavy draft mares on placental retention time and reproductive performance and on white muscle disease in their foals

The toxic dietary level for chronic toxicity is 20 ppm or 20 mg per day from food sources.

There are a number of studies that show organic selenium yeast is better absorbed, stored and utilised by horses and other animals than inorganic selenium like sodium selenite.

For example:

Calamari L, Abeni F and Bertin G (2009) Metabolic and hematological profiles in mature horses supplemented with different selenium sources and doses https://www.animalsciencepublications.org/publications/jas/abstracts/88/2/650

Calamari L, Ferrari A, Bertin G (2009) Effect of selenium source and dose on selenium status of mature horses  http://www.ncbi.nlm.nih.gov/pubmed/18791154

Montgomery B et al (2012) Effects of selenium source on measures of selenium status and immune function in horses  http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3460607