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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.
Trail Time (McCauley’s Equine Formulas)
Complete FeedComplete Feed
Feed EfficiencyFeed Efficiency
Gut HealthGut Health
HealthHealth
Trail Time® is an oat-based textured feed targeted at adult horses at maintenance or in light work. It provides a lower energy density and fat content than other McCauley feeds.
Training Formula (Triple Crown) – [Discontinued]
EnergyEnergy
ExerciseExercise
FatFat
PerformancePerformance
Triple Crown Training Formula is now a discontinued feed which was a high-calorie, high-fat feed designed to meet the energy requirements of exercising horses. Energy sources included oats, molasses, soybeans, beet pulp, alfalfa and wheat middlings.
Tribute Ultra (Tribute)
ExerciseExercise
FatFat
NutrientsNutrients
Weight IssuesWeight Issues
Tribute Ultra is intended for hard keepers and horses and ponies in heavy work. This feed is meant to support weight gain and performance with its 12% fat and 12% protein formula.
Trifecta (Buckeye) – [Discontinued]
Complete FeedComplete Feed
FlavorFlavor
NutritionNutrition
PerformancePerformance
Buckeye TRIFECTA™ Sweet Pelleted Feed is a palatable and calorie-dense feed containing cane molasses to increase intake. TRIFECTA™ is intended for performance horses with higher energy demands.
Trifecta (Horse Guard)
HealthHealth
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
Trifecta from Horse Guard is a powdered vitamin, mineral, hoof, and joint supplement with added prebiotics and probiotics. It contains glucosamine, MSM, and hyaluronic acid to help with joint support. Trifecta also contains added iron and 32 mg of biotin per serving.
Triformance (McCauley’s Equine Formulas)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
Triformance® is a textured feed targeted to performance horses, including racehorses and eventers. It has high energy and fat content and provides higher levels of antioxidant nutrients such as Vitamin E.
Triple Play (Equi-lete)
Gut HealthGut Health
HealthHealth
PerformancePerformance
Weight IssuesWeight Issues
Triple Play by Equi-lete is a vitamin and mineral supplement intended to support gastric health, performance and body condition in hard keepers, performance horses and breeding stock.
Triplify (Excel Equine Feeds)
Competition HorsesCompetition Horses
HealthHealth
NutritionNutrition
PerformancePerformance
Triplify is a textured feed from Excel Equine Feeds. Triplify is intended for horses in moderate to heavy work, and contains 10% protein and 10% fat.
Tru Breed (Hygain)
AntioxidantAntioxidant
BroodmareBroodmare
DigestionDigestion
GrowthGrowth
Tru Breed by Hygain is a soy-free extruded feed intended for breeding and growing horses.
Tru Care (Hygain)
DigestionDigestion
NutrientsNutrients
NutritionNutrition
SeniorSenior
Tru Care from Hygain is an extruded feed intended for horses requiring extra calories, such as senior horses. Tru Care contains glucosamine intended to support joint health.
Tru Gain (Hygain)
Competition HorsesCompetition Horses
HealthHealth
NutritionNutrition
Weight IssuesWeight Issues
Tru Gain is an extruded fat supplement for horses. This pelleted supplement contains added vitamin E and selenium. Tru Gain is intended for performance horses and horses who require additional calories.
Turbo Mag BCAA (Stride Animal Health)
Competition HorsesCompetition Horses
ElectrolyteElectrolyte
ExerciseExercise
HealthHealth
Turbo Mag BCAA from Stride Animal Health is a powdered electrolyte for horses. Turbo Mag BCAA is intended to support hydration levels and replace lost electrolytes.
U-Balance Foundation (Uckele)
FiberFiber
Mineral BalanceMineral Balance
ProteinProtein
VitaminsVitamins
Uckele U-Balance Foundation is a pelleted vitamin, mineral, and amino acid supplement for horses. It is intended to balance the diet without adding significant calories. This supplement can also supports sugar metabolism.
ULTIMATE FINISH 25 (BUCKEYE Nutrition)
FatFat
Omega 3-6-9Omega 3-6-9
Skin + HairSkin + Hair
Weight IssuesWeight Issues
Ultimate Finish 25 is a high-fat (25%) supplement intended for use as a top-dressing to add energy to the diet for working horses or horses that need to gain weight gain. It is formulated with soybeans, flaxseed, and rice bran.
Ultimate Recovery (Buckeye)
Amino AcidAmino Acid
Competition HorsesCompetition Horses
ExerciseExercise
RecoveryRecovery
Buckeye Ultimate Recovery is an extruded performance horse supplement containing added fats and branched-chain amino acids to support muscle and tissue recovery. This supplement also contains electrolytes to aid in rehydration.
Ultra Complete (Tribute)
EnergyEnergy
FatFat
PerformancePerformance
Weight IssuesWeight Issues
Ultra Complete is a high-fat and fibre textured feed formulated for adult horses in heavy work, such as racehorses in training. It is made with beet pulp, molasses, whole oats and soybeans.
Ultra Dynamix (Seminole)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
Organic Trace MineralsOrganic Trace Minerals
ProteinProtein
Seminole Ultra Dynamix™ is a high-calorie pelleted horse feed for growing, breeding and performance horses. It contains oats, corn, digestible fibers, soybean oil and stabilized rice bran.
Ultra GH (Tribute)
FatFat
Feed EfficiencyFeed Efficiency
FiberFiber
Gut HealthGut Health
Tribute Ultra GH is a complete pelleted feed intended to support gastrointestinal health in performance horses. It contains added microencapsulated dry yeast, direct-fed microbials, organic and inorganic trace minerals. It provides 8% crude fat and 21.5% NSC.
Ultra Mate (Elk Grove Milling)
Competition HorsesCompetition Horses
EnergyEnergy
JointsJoints
Weight IssuesWeight Issues
Ultra Mate by Elk Grove Milling is a corn based supplement intended to provide extra energy for competition horses, hard keepers, stallions and lactating mares.
UltraCruz Equine Antioxidant (Santa Cruz Animal Health)
AntioxidantAntioxidant
HealthHealth
Mineral BalanceMineral Balance
VitaminsVitamins
UltraCruz Equine Antioxidant is a pelleted vitamin and mineral supplement for horses. It provides the antioxidants selenium, vitamin C and vitamin E to potentially protect cells from oxidative damage.
UltraCruz Equine Iron Charge Plus (Santa Cruz Animal Health)
ExerciseExercise
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
UltraCruz Equine Iron Charge Plus is a pelleted iron supplement for horses. It contains ferrous gluconate as well as other vitamins and minerals. Most horses exceed iron requirements in the diet and do not need to be supplemented.
UltraCruz Equine Selenium (Pellet) (Santa Cruz Animal Health)
AntioxidantAntioxidant
MetabolismMetabolism
Mineral BalanceMineral Balance
MuscleMuscle
UltraCruz Equine Selenium is a pelleted supplement that provides 2.4 mg of organic selenium per serving. Selenium is an antioxidant that can protect cells from oxidative stress.
UltraCruz Equine Selenium (Powder) (Santa Cruz Animal Health)
AntioxidantAntioxidant
MetabolismMetabolism
Mineral BalanceMineral Balance
MuscleMuscle
UltraCruz Equine Selenium is a powdered supplement for horses that provides 2.4 mg of organic selenium per serving. This micromineral is an antioxidant that can protect against oxidative damage.
UltraCruz Equine Trace Mineral (Santa Cruz Animal Health)
HealthHealth
Mineral BalanceMineral Balance
Omega 3-6-9Omega 3-6-9
VitaminsVitamins
UltraCruz Equine Trace Mineral is a pelleted mineral supplement for horses. It contains 14% protein and supplies several minerals including selenium, copper, zinc, and manganese.
UltraCruz Equine Wellness Performance Supplement (Santa Cruz Animal Health)
HealthHealth
Mineral BalanceMineral Balance
Omega 3-6-9Omega 3-6-9
VitaminsVitamins
UltraCruz Equine Wellness Performance Supplement is formulated to supplement vitamins and minerals, antioxidants, and fatty acids to the horse’s diet. This includes zinc, copper, and Vitamin E. It supplies 2 mg of biotin per serving (136 g).
Ultramin (Equis Feed)
HealthHealth
Mineral BalanceMineral Balance
VitaminsVitamins
YeastYeast
Ultramin by Equis Feed is a free-choice vitamin-mineral supplement for horses that can also be used to top-dress rations. It is formulated with organic minerals, biotin, yeast, and calcium carbonate.
Unbeetable Balance (Unbeetable Feeds)
FiberFiber
Grain FreeGrain Free
Mineral BalanceMineral Balance
VitaminsVitamins
Unbeetable Balance is a ration balancer from Unbeetable Feeds. It is a grain-free, pelleted formulation intended for horses that require controlled calorie intake.
Unbeetable Complete (Unbeetable Feeds)
EnergyEnergy
Grain FreeGrain Free
Low NSC FeedsLow NSC Feeds
ProteinProtein
Unbeetable Complete by Unbeetable feeds is a grain free complete feed intended for all horse types. It contains a blend of organic and inorganic trace minerals.
Velocity (Ark Nutrition)
Complete FeedComplete Feed
ExerciseExercise
NutritionNutrition
ProteinProtein
Velocity by Ark Nutrition is a pelleted feed intended for horses in moderate to heavy work. It contains a blend of essential amino acids and fatty acids meant to support muscle development and improve muscle recovery.
Vermont Blend (Custom Equine Nutrition)
Amino AcidAmino Acid
DigestionDigestion
Mineral BalanceMineral Balance
YeastYeast
Vermont Blend by Custom Equine Nutrition is a supplement intended to balance out the deficiencies when a horse is solely fed grass hay. It contains amino acids, biotin and minerals such as copper and magnesium.
Vermont Blend Pellets (Custom Equine Nutrition)
Amino AcidAmino Acid
Mineral BalanceMineral Balance
VitaminsVitamins
YeastYeast
Vermont Blend by Custom Equine Nutrition is a pelleted supplement intended to be fed to horses solely on grass hay. It contains amino acids, biotin and minerals such as copper and magnesium.
Vermont Blend Pro (Custom Equine Nutrition)
Gut HealthGut Health
Hoof HealthHoof Health
Organic Trace MineralsOrganic Trace Minerals
Ration BalancerRation Balancer
Vermont Blend Pro is a forage balancer and hoof supplement with added yeast cultures. It uses organic sources of copper and zinc. It has a lower feeding rate than the original Vermont Blend.
Victoria Racer’s Edge (Thomas Moore Feed)
EnergyEnergy
FatFat
NutrientsNutrients
PerformancePerformance
Victoria Racer's Edge from Thomas Moore Feed is a performance feed that is high in energy and is meant to be fed alongside forage. It contains vitamins and minerals and is intended to support body condition.
Victory! (Seminole)
FatFat
Feed EfficiencyFeed Efficiency
PerformancePerformance
StaminaStamina
Seminole Victory!™ is a beet pulp-based textured feed containing oats, barley and stabilized rice bran. It contains 29% NSC and is targetted to mature performance horses.
Vintage Mare & Foal (Blue Seal) – [Discontinued]
Complete FeedComplete Feed
FoalFoal
GrowthGrowth
LactationLactation
Vintage Mare & Foal by Blue Seal is a now-discontinued feed which was a high-protein, high-energy extruded feed targeted to broodmares during pregnancy and lactation, as well as growing horses. It contained grains such as oats, corn, and barley, as well as soybean and alfalfa meal.
Vintage Sweet (Blue Seal) – [Discontinued]
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
NutritionNutrition
Weight IssuesWeight Issues
Vintage Sweet by Blue Seal is a now-discontinued feed with lower-protein, high-fat extruded feed formulated for working horses. It contained 12% crude protein and 8% fat, with energy supplied by cracked corn, oats, wheat, molasses, and oil.
Vitalize Equine High Performance (Biozyme)
Gut HealthGut Health
Mineral BalanceMineral Balance
PrebioticPrebiotic
VitaminsVitamins
Vitalize Equine High Performance by Biozyme is a pelleted supplement containing vitamins and minerals, it is intended for performance horses.
Vitamin E & Selenium (AniMed)
AntioxidantAntioxidant
DigestionDigestion
Gut HealthGut Health
ImmunityImmunity
This powdered supplement from AniMed is an antioxidant that contains vitamin E, selenium, yeast and zinc. These help support a healthy immune system and digestive and gut health.
Vitamin E & Selenium Crumblet (AniMed – Plateau)
AntioxidantAntioxidant
DigestionDigestion
ImmunityImmunity
MuscleMuscle
Vitamin E & Selenium Crumblet is a Plateau from AniMed product in a crumblet form. It contains antioxidants, selenium, vitamin E, and zinc. These ingredients can help with horse health including immunity, digestion, and muscle health.
Vitamin E 5000 and Organic Selenium (Horse Guard)
AntioxidantAntioxidant
MuscleMuscle
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Vitamin E 5000 and Organic Selenium by Horse Guard is an equine supplement that provides 5000 IU of natural vitamin E and 3 mg of organic selenium per serving. These nutrients are antioxidants that are meant support healthy muscle function and exercise recovery.
Vitamin E+ (Equine Choice)
HealthHealth
ImmunityImmunity
RecoveryRecovery
VitaminsVitamins
Vitamin E+ by Equine Choice is a highly concentrated pellet form of Vitamin E. Each 10g scoop contains 2,500 IU of natural Vitamin E.
Vitamin Gold (Dumor)
ImmunityImmunity
Mineral BalanceMineral Balance
VitaminsVitamins
YeastYeast
DuMOR Vitamin Gold is a pelleted mineral and vitamin supplement intended for all classes of horses and ponies. It is formulated to supplement diets containing poor quality forage.
Vitamins & Minerals Alfalfa (Equine Challenge)
HealthHealth
Mineral BalanceMineral Balance
Ration BalancerRation Balancer
VitaminsVitamins
Vitamins and Minerals Alfalfa by Equine Challenge is a vitamin and mineral supplement intended for horses on Alfalfa based diets.
Vitamins & Minerals Grass (Equine Challenge)
Vitamins & Minerals Grass from Equine Challenge is an equine supplement formulated for horses on grass diets. Vitamins & Minerals Grass is intended to assist in healthy coat and hoof growth. This supplement is formulated with flaxseed, added vitamins, minerals, and probiotics.
Vitamor Performance Supplement for Multi-Species (DuMor)
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Vitamor by DuMor is a multi-species performance supplement providing support for growth, energy, coat health, and overall digestion. Vitamor is a source of protein and energy for equine diets.
VTM 20 – Pellet (Masterfeeds)
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
ProteinProtein
VitaminsVitamins
Masterfeeds VTM 20 is a pelleted high protein vitamin-mineral supplement that can be fed alone or in conjunction with complete feeds. It is formulated for horses fed lower protein hay or those in moderate to high-intensity work.
WB100 (McCauley’s Equine Formulas)
Caloric EnergyCaloric Energy
ExerciseExercise
PerformancePerformance
Ration BalancerRation Balancer
WB100 is a high-energy pelleted feed for performance horses that contains vegetable oil as a source of added fat. It provides additional calories without excessive protein. It was also designed to support gut health.
Wellness Calm and Cool® (Seminole)
Complete FeedComplete Feed
FiberFiber
HerbHerb
Low NSC FeedsLow NSC Feeds
Wellness Calm and Cool® is a textured feed designed for easy keepers and ponies. It provides high levels of digestible fibre, and contains 3% fat and 21% NSC.
Wellness Compete Safe (Seminole) – [Discontinued]
Complete FeedComplete Feed
Competition HorsesCompetition Horses
ExerciseExercise
Low NSC FeedsLow NSC Feeds
Seminole Wellness Compete Safe is a now-discontinued textured horse feed targeted to active horses. It was advertised as a low-starch, high-fat feed with added herbs and stabilized rice bran.
Wellness DynaSport (Seminole)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
EnergyEnergy
FatFat
Wellness DynaSport™ is a textured feed with 14% fat to meet the high energy needs of equine athletes. It contains 15% NSC (sugar and starch). This feeds supports the performance and recovery of performance horses.

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