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Selenium - Feed Ingredient

Selenium is an essential trace mineral required in equine nutrition for its role in antioxidant defense, immune function, and thyroid hormone metabolism. It is a key component of glutathione peroxidase, an enzyme that helps protect cells from oxidative damage by neutralizing free radicals. Selenium also plays a role in muscle function and overall metabolic health.

Horses can obtain selenium from forages, but its content varies depending on soil selenium levels in different regions. In areas with selenium-deficient soils, supplementation is necessary to prevent deficiencies, which can lead to conditions such as white muscle disease, impaired immune function, and poor reproductive health. Selenium is commonly supplemented in the form of sodium selenite, sodium selenate, or organic selenium sources such as selenium yeast, which is considered more bioavailable.

Because selenium has a narrow margin of safety, excessive intake can lead to toxicity, characterized by symptoms such as hair loss, hoof abnormalities, and neurological issues. Proper formulation and monitoring of selenium intake are essential to ensure optimal health in horses.

The following equine feeds, supplements and products contain Selenium 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.
Ultium Gastric Care (Purina)
Competition HorsesCompetition Horses
Gut HealthGut Health
StressStress
UlcersUlcers
Purina® Ultium® Gastric Care is a concentrate feed intended for performance horses to support gastric and hindgut health. It provides digestible fibres from beet pulp, alfalfa and soy hulls.
Ultium Growth Formula (Purina)
BroodmareBroodmare
Complete FeedComplete Feed
GrowthGrowth
LactationLactation
Purina Ultium® Growth Formula is a concentrate feed intended for breeding and growing horses. It provides 9.5% fat with added amino acids to support development.
Ultium® Competition Horse Formula (Purina Mills)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
Ultium Competition Horse Formula is a pelleted horse feed designed to support horses in competition. It is a high-fat, high-fibre ration that contains 12% protein.
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 Advanced Joint Supplement (Santa Cruz Animal Health)
GrowthGrowth
JointsJoints
PerformancePerformance
SeniorSenior
UltraCruz Equine Advanced Joint Supplement is a pelleted joint supplement containing glucosamine, MSM, chondroitin sulfate, and hyaluronic acid. It has added vitamins and minerals as well as molasses for flavouring.
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 Joint Supplement (Santa Cruz Animal Health)
GrowthGrowth
JointsJoints
PerformancePerformance
SeniorSenior
UltraCruz Equine Joint Supplement is a soy-free joint formula for horses. It contains chondroitin sulfate, glucosamine, hyaluronic acid, and MSM. This supplement is designed to support joint, tendon, and ligament health.
UltraCruz Equine Liqui-Sel (Santa Cruz Animal Health)
AntioxidantAntioxidant
Mineral BalanceMineral Balance
MuscleMuscle
VitaminsVitamins
UltraCruz Equine Liqui-Sel is a liquid antioxidant supplement for horses. It provides selenium, vitamin C, and vitamin E. This supplement can help support immune function and hair, hoof, and skin condition.
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.
UN-LOCK Race Performance Powder (BRL Equine)
Amino AcidAmino Acid
ElectrolyteElectrolyte
ExerciseExercise
PerformancePerformance
UN-LOCK Equine Race Performance Powder is a muscle supplement containing branched-chain amino acids, vitamins, and electrolytes. It is a source of the amino acids L-valine, L-leucine, L-isoleucine, l-glutamine, L-arginine, and L-carnitine.
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.
Vantiox (Omega Alpha)
AntioxidantAntioxidant
MuscleMuscle
NutrientsNutrients
RecoveryRecovery
Vantiox is an antioxidant supplement that provides vitamin C (ascorbic acid), synthetic vitamin E, organic zinc, beta carotene and organic selenium. Antioxidants can support metabolic function, muscle health, exercise recovery and other processes.
Veloci-T Max (Purina)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
Purina Veloci‑T Max is a textured feed intended for racehorses, breeding stallions, early gestating mares, and yearlings. . It is formulated with higher fat and starch levels to meet the high energy demands of performance horses.
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.
Versa (Sollio Agriculture)
HealthHealth
ImmunityImmunity
NutrientsNutrients
NutritionNutrition
Versa is a pelleted feed intended for horses in all forms of exercise. This feed contains 14% crude protein and 6% fat. Versa is intended to be fed as an all-purpose feed.
Versatile Pelleted (Bluebonnet Feeds)
Gut HealthGut Health
HealthHealth
NutrientsNutrients
NutritionNutrition
Versatile Pelleted by Bluebonnet Feeds is a multi-purpose feed intended for cattle, horses, sheep and goats.
Versatile Ranch Hand (Bluebonnet Feeds)
DigestionDigestion
HealthHealth
NutrientsNutrients
NutritionNutrition
Versatile Ranch Hand by Bluebonnet Feeds is a pelleted feed intended to support cattle, sheep, goats and horses at maintenance or on pasture.
Versatile Sweet (Bluebonnet Feeds)
DigestionDigestion
FlavorFlavor
NutrientsNutrients
NutritionNutrition
Versatile Sweet by Bluebonnet Feeds is a textured feed intended for cattle, sheep, goats and horses of all life stages.
Veteran Light (Allen & Page)
DigestionDigestion
Easy KeeperEasy Keeper
Low NSC FeedsLow NSC Feeds
NutritionNutrition
Veteran Light from Allen & Page is a low-energy pelleted feed that is high in fibre with a low NSC content (8.5%). Veteran Light is a palatable horse feed with added probiotics.
Veteran Vitality (Allen & Page)
DigestionDigestion
IngredientIngredient
NutritionNutrition
SeniorSenior
Veteran Vitality from Allen & Page is a palatable feed for horses with poor dentition. This feed is high in fibre and includes added vitamins and minerals. Veteran Vitality contains herbs such as mint, nettle, dandelion, garlic, and fenugreek.
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.
Vit-E-Sel Natural (Select The Best)
AntioxidantAntioxidant
ImmunityImmunity
Mineral BalanceMineral Balance
VitaminsVitamins
Vit-E-Sel Natural by Select The Best is a pelleted supplement that provides vitamin E and selenium that are essential to many functions in the horse, including stress tolerance and muscle function.
Vita E & Selenium Crumble (Pharm-Vet)
AntioxidantAntioxidant
HealthHealth
Mineral BalanceMineral Balance
RecoveryRecovery
Pharm-Vet Vitamine E and Selenium crumble is an equine supplement to support muscle function in horses exerting physical effort. It contains inorganic sodium selenite at 70 mg/kg.
Vita E and Selenium Crumbles (Pharm-Vet)
AntioxidantAntioxidant
Mineral BalanceMineral Balance
MuscleMuscle
VitaminsVitamins
Vita E and Selenium Crumbles by Pharm-Vet is a pelleted vitamin and mineral supplement for horses that intends to promote muscular health and muscle growth.
Vita Plus (Farnam)
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Farnam Vita Plus is a pelleted vitamin and mineral supplement for horses. It is designed to provide organic and inorganic trace minerals.
Vita-Min E & Selenium (Farnam)
AntioxidantAntioxidant
ImmunityImmunity
Mineral BalanceMineral Balance
MuscleMuscle
Farnam Vita-Min E & Selenium is an antioxidant supplement designed to support muscular health. It provides 625 IU of synthetic vitamin E and 1 mg of inorganic selenium per serving.
VITAboost-Pellet (Herbs for Horses)
Blood CellsBlood Cells
MetabolismMetabolism
Mineral BalanceMineral Balance
VitaminsVitamins
Vitaboost is a multivitamin blend for horses containing 8 water soluble B-vitamins, Vitamin C, natural Vitamin E, microminerals, organic selenium, and amino acids.
VITAboost-Powder (Herbs for Horses)
Blood CellsBlood Cells
MetabolismMetabolism
Mineral BalanceMineral Balance
VitaminsVitamins
Vitaboost is a multivitamin blend for horses containing 8 water soluble B-vitamins, Vitamin C, natural Vitamin E, microminerals, organic selenium, and amino acids.
Vital 33 (Menuerie Benjamin)
HealthHealth
Organic Trace MineralsOrganic Trace Minerals
ProteinProtein
VitaminsVitamins
Vital 33 by Meunerie Benjamin is a high-protein, high-energy equine supplement formulated to support topline development and improve overall body condition. This supplement can be fed on its own or alongside a complete feed.
Vital Glo (Meunerie Benjamin)
Gut HealthGut Health
JointsJoints
Mineral BalanceMineral Balance
VitaminsVitamins
Vital Glo from Meunerie Benjamin is a cubed supplement containing vitamins and minerals. It is meant to support growing, performance or reproductive horses. It is also intended to assist with gut, joint, and hoof health.
Vitalize Equine Free Choice (BioZyme)
HealthHealth
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Vitalize Equine Free Choice by BioZyme is a vitamin and mineral supplement that supports digestion, nutrient absorption, and hindgut support. This feed additive is for horses on pasture and includes a prebiotic that aids with digestion.
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.
Vitalize Equine Protein Pellet (BioZyme)
BroodmareBroodmare
GrowthGrowth
ProteinProtein
SeniorSenior
Vitalize Equine Protein Pellet by Biozyme is a protein supplement intended for growing, breeding, senior and performance horses.
Vitalize Equine Vitamin & Mineral Supplement (Biozyme)
DigestionDigestion
Mineral BalanceMineral Balance
PrebioticPrebiotic
VitaminsVitamins
Vitalize Equine Vitamin and Mineral Supplement by Biozyme is a powdered vitamin and mineral supplement intended to support nutritional and digestive health in horses.
Vitamin E & Selenium (Finish Line)
AntioxidantAntioxidant
MuscleMuscle
NutrientsNutrients
PerformancePerformance
Vitamin E & Selenium by Finish Line is a powder supplement. It contains synthetic vitamin E and inorganic selenium.

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