Sel-Plex® is an organic source of selenium produced by yeast. Selenium is a chemical element with the symbol Se. Selenium is an essential nutrient for animals, however, in large doses it can be toxic. In the animal selenium protects against oxidative damage and infection. It is furthermore a constituent of several selenoproteins that play critical roles in reproduction, thyroid hormone metabolism and DNA synthesis.  

The product is authorised for use in the EU for all species

Main claim
Better utilization of selenium compared with inorganic sources. 

Technical specifications for Sel-Plex®

EU category Nutritional additive
Functional group of additives Compound of trace element 
Composition Selenomethionin and low molecular weight selenocomponents. According to EFSA (2006) 63 % of the organic Se is Selenomethionin.
Dry matter: >94 %; crude protein: 47 %; crude ash: 7 %
Active substance  Organic form of selenium produced by Saccharomyces cerevisiae CNCM I-3060. 
EU code 3b810
EU approval All species.  The maximum total content of selenium must not exceed 0.50 mg/kg of complete feed
End of period of EU authorisation 9 June 2029 
Safety and handling It is recommended to handle the product in ventilated areas. If airborne concentration of the product is high it is recommended to wear breathing protection. It is also recommended to wear safety glasses and glove during handling.
Specific conditions for use Use only through a premixture
Shelf-life Shelf-life is at least 24 months if stored at room temperature. When incorporated into a premixture the recovery of selenium was stable for at least 12 months when stored at temperatures from 20°C to 40°C. 
Heat stability Pelleting at temperatures up to 95°C did not affect the total content of Selenium in complete feed.
Characterisation of product Light to dark brown and free-flowing powder. The product is dispersible in water. Thirteen percent of the particles are between 0.5 and 0.1 mm and 87 % are below 0.1 mm and there is a low dusting potential.
Producer Alltech


List of references

EFSA (2006). Opinion of the Scientific Panel on additives and products or substances used in animal feed on the safety and efficacy of the product Selplex® 2000 as a feed additive according to Regulation (EC) No 1831/2003. The EFSA Journal (2006) 348, 1-40 

EFSA (2011). Scientific opinion on safety and efficacy of Sel-Plex® (organic form of selenium produced by Saccharomyces cerevisiae CNCM I-3060) for all species. EFSA Journal 2011;9(4):2110 

EU (2019). Commission implementing Regulation (EU) 2019/804 of 17 May 2019 concerning the renewal of the authorisation of organic form of selenium produced by Saccharomyces cerevisiae CNCM I-3060 and of selenomethionine produced by Saccharomyces cerevisiae NCYC R397 as feed additives for all animal species and repealing Regulations (EC) No 1750/2006 and (EC) No 634/2007. Official Journal of the European Union. L 132/28-32