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Selenium Yeast - Feed Ingredient

Selenium yeast is an organic form of selenium produced by fermenting yeast (Saccharomyces cerevisiae) in a selenium-enriched medium. During fermentation, the yeast incorporates selenium into amino acids which is the most bioavailable form of selenium for animals. Selenium yeast is commonly used in livestock and equine nutrition to support antioxidant function, immune health, and proper muscle function.

Compared to inorganic sources like sodium selenite, selenium yeast is more efficiently absorbed and retained in tissues, leading to improved selenium status in the body. Selenium yeast is also considered safer than selenium salts, as it has a lower risk of toxicity.

Selenium is an essential trace mineral required for the activity of glutathione peroxidase, an enzyme that protects cells from oxidative damage. Horses and other animals depend on dietary selenium because they cannot synthesize it internally.

In horses, selenium deficiency can lead to muscle weakness, poor immune response, and white muscle disease in foals. However, excessive selenium intake can be toxic, causing symptoms such as hoof cracking, hair loss, and neurological issues.

The following equine feeds, supplements and products contain Selenium Yeast as an ingredient.

Feeds, Supplements & Products
AminoTrace+ Vitamin and Mineral Supplement (Mad Barn)
Hoof HealthHoof Health
Metabolic SyndromeMetabolic Syndrome
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
AminoTrace+ by Mad Barn is a complete, balanced equine mineral and vitamin supplement designed for horses with metabolic concerns. It is ideal for horses with IR, PPID, or high iron in the diet.
Natural E/Organic Se (Mad Barn)
AntioxidantAntioxidant
Organic Trace MineralsOrganic Trace Minerals
RecoveryRecovery
VitaminsVitamins
Natural E/Organic Se is a pelleted supplement providing organic Selenium yeast and natural Vitamin E. These two nutrients are important antioxidants that support muscle function and anti-inflammatory pathways.
Omneity P – Pellets – Vitamin & Mineral Supplement (Mad Barn)
Gut HealthGut Health
Hoof HealthHoof Health
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
Ration BalancerRation Balancer
Omneity Pellets is a balanced mineral and vitamin supplement for horses in a palatable pellet form. It provides 100% organic trace minerals, complete B-vitamin fortification, added Vitamin E, yeast and digestive enzymes.
Omneity Premix – Vitamin & Mineral Supplement (Mad Barn)
Hoof HealthHoof Health
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Omneity Premix is a balanced mineral and vitamin supplement for horses providing 100% organic trace minerals, complete B-vitamin fortification, added Vitamin E, yeast, and digestive enzymes.
Trace Mineral Pak (Mad Barn)
Coat QualityCoat Quality
ExerciseExercise
Hoof HealthHoof Health
Organic Trace MineralsOrganic Trace Minerals
Trace Mineral Pak from Mad Barn is a balanced equine supplement providing 100% organic (chelated) trace minerals. Ingredients include selenium, zinc, copper, and manganese.

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