Get The Most Out of Your Organic Selenium Supplementation With Selisseo®

Selisseo® is the only pure form of organic selenium in-feed suppliment.



Selenium (Se) is an essential trace mineral for animal nutrition.

Hydroxy-Selenomethionine (OH-SeMet), Selenium, plays a key role in antioxidant defense, immunity, reproduction, and inflammatory modulation processes. While inorganic, Se is commonly used for feed supplements. Recent research confirmed that organic Se, specifically selenomethionine (SeMet) or hydroxy-selenomethionine (OH-SeMet), is much more easily integrated into the body.

Selisseo® is FDA approved for use in poultry, swine, and cattle in the US and approved for use in all species in Canada. 

100% PURE OH-SeMet

Selisseo® provides 100% OH-SeMet batch after batch

On average, Selenium Yeast products contain 60% SeMet and the amount of SeMet varies from batch to batch, while Selisseo® is the only pure form of organic Selenium that consistently provides 100% selenium as OH-SeMet, batch after batch.

Selisseo’s consistent particle size without fines makes safe and easy mixing in the feed, with low dust levels.


Selisseo® maintains higher the milk yield and milk quality under challenging conditions (such as parturition and heat stress), while enhancing the cow’s antioxidant functions


Selisseo® allows selenium to be transferred from the dam to the calf, promoting calf health.

(1) Sun et al., 2017, Journal of Dairy Science. 100(12), 9602-9610

(2)  Hachemi et al, 2023. Journal of Dairy Science. 106:1 -12

(3) Sun et al., 2019, Journal of Dairy Science. 102(1), 311-319

(4) Trial conducted in the UK at the University of Reading, 2019

(5) Juniper et al., 2019, Journal of Dairy Science, 1102(8 ), 7000-7010

More data is available upon request.

Even in challenging conditions, performance will be supported.

Animals experience various stresses throughout their life. To restore antioxidant balance and performance of the animal, Adisseo offers Selisseo. Watch this video to learn more about Selenium and Selisseo.

More Scientific Research

Inorganic and Organic Selenium Speciation of Seleno‑Yeasts Used as Feed Additives
New Insights from Elemental Selenium Determination.

Seleno-Yeasts (SY) used as feed additives are known to contain diferent Selenium (Se) species. Seleno-Yeasts has been shown, on previous analytical methods, to contain selenomethionine (SeMet), selenocysteine (SeCys), selenate (SeIV) and selenite (SeVI), and various other organic and inorganic Se forms identifed but rarely quantifed…

Selenium cow

Understanding Selenium with Darlene Bloxham - Adisseo

Selenium supplementation in pig diets: myths and truths - Dr. Darlene Bloxham
Meet the guest: Dr. Darlene Bloxham, Nutritionist at Adisseo


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