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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.
Excell E (Equistro)
AntioxidantAntioxidant
MetabolismMetabolism
NutrientsNutrients
VitaminsVitamins
Excell E is a liquid equine supplement providing bioavailable vitamin E, lysine, magnesium, and organic selenium. It is intended to support muscle tissue in performance or leisure horses.
EZ (Tribute)
CalmingCalming
ExerciseExercise
FatFat
FiberFiber
Tribute Equine EZ Pellets is a 20% fibre, 8% fat feed intended for hard keepers and mature horses with higher energy requirements. It is formulated with reduced sugar and starch content and provides a maximum 13.5% NSC.
EZ-Balance (Purina Canada)
HealthHealth
Low NSC FeedsLow NSC Feeds
NutrientsNutrients
Ration BalancerRation Balancer
EZ-Balance is a low-calorie pelleted vitamin-mineral supplement formulated with organic copper, zinc and manganese. It has a low feeding rate of 150-200 grams per day.
Fab Fiber Plus (McCauley’s)
FiberFiber
HealthHealth
NutrientsNutrients
PerformancePerformance
Fab Fiber Plus from McCauley's is a textured feed intended for performance horses. It contains 17% fiber, 12% fat, and 12% protein.
Fast Fibre (Allen & Page)
Easy KeeperEasy Keeper
FiberFiber
IngredientIngredient
Low NSC FeedsLow NSC Feeds
Fast Fibre from Allen & Page is a low-energy horse feed. Fast Fibre is high in fibre with a low NSC content (7.5%). Fast Fibre is recommended to be fed soaked.
Fat ‘N’ Fibre (pellet) (Masterfeeds)
ExerciseExercise
FatFat
FiberFiber
HealthHealth
Fat 'N' Fibre from Masterfeeds is a pelleted feed that is higher in fat and fibre. It is formulated for idle horses to horses in light work. Fat 'N' Fibre contains 12% protein, 5% fat, and 15% fiber.
Ferto-LAC3 Mare Pellets (Havens Horsefeed)
Amino AcidAmino Acid
BroodmareBroodmare
FoalFoal
GrowthGrowth
Ferto-LAC3 Mare Pellets is a high-energy equine feed for broodmares and foals. It contains added calcium, phosphorus, and magnesium to support development and milk production.
Fiber & Fat Comfort (Meunerie Benjamin)
DigestionDigestion
FiberFiber
Gut HealthGut Health
ImmunityImmunity
Fiber & Fat Comfort by Meunerie Benjamin is a feed that is high in fiber and contains vitamins, minerals, and yeast. It is intended to support the immune system, gut health and digestion.
Fiber Boost (Ark Nutrition)
FiberFiber
Low NSC FeedsLow NSC Feeds
Mineral BalanceMineral Balance
VitaminsVitamins
Ark Nutrition Fiber Boost is a concentrated fiber source with added vitamins and minerals. It has low sugar and starch content, suitable for metabolic horses.
Fiber First (Excel Equine Feeds)
FatFat
FiberFiber
HealthHealth
NutritionNutrition
Fiber First from Excel Equine Feeds is a textured feed. This feed is intended to be high fat and high fat, with an increased beet pulp content.
Fiberforce (Cavalor)
FiberFiber
Gut HealthGut Health
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
Fiberforce by Cavalor is a high-fiber feed made with alfalfa stems to encourage chewing and buffer stomach acid. It is targeted to horses with gastrointestinal problems such as gastric ulcers. It has an NSC value of 8%.
Fiberforce Gastro (Cavalor)
FiberFiber
Gut HealthGut Health
Low NSC FeedsLow NSC Feeds
UlcersUlcers
Fiberforce Gastro by Cavalor is a textured feed intended for horses prone to ulcers or stomach problems.
Fibre Balancer (Dunstan)
GrowthGrowth
Low NSC FeedsLow NSC Feeds
Mineral BalanceMineral Balance
Ration BalancerRation Balancer
Fibre Balancer by Dunstan is a semi-concentrate feed, intended for young growing horses that have access to high quality forage.
Fibre Grow (Dunstan)
BroodmareBroodmare
FiberFiber
FoalFoal
LactationLactation
Fibre Grow by Dunstan is a low-starch, high-fibre pellet intended to meet the requirements of pregnant and lactating mares as well as young growing horses.
Fibre O Plus (Brooks Feeds)
ExerciseExercise
FatFat
FiberFiber
Omega 3-6-9Omega 3-6-9
Fibre O Plus is a textured performance feed for horses with higher energy demands. It provides added calories from beet pulp and fat sources such as flax and rice bran.
Fibre Plus (Dunstan)
Bone HealthBone Health
Complete FeedComplete Feed
FiberFiber
GrowthGrowth
Fibre Plus by Dunstan is a high fibre, low starch pelleted feed intended to meet the nutrient requirements of young growing horses.
Fibre-Lite Forage Replacer (Brooks)
Easy KeeperEasy Keeper
FiberFiber
Hay StretcherHay Stretcher
SeniorSenior
Fibre-Lite Forage Replacer is a pelleted feed containing 25% fibre from digestible sources such as soy hulls, wheat shorts, alfalfa meal, and beet pulp. It can be used as a partial hay replacer or for horses with lower energy requirements.
Fibrenergy (Hallway Feeds)
Competition HorsesCompetition Horses
FiberFiber
Grain FreeGrain Free
Low NSC FeedsLow NSC Feeds
Hallway Fibrenergy is a high-fat, high-fibre textured feed designed for performance horses. Fibrenergy is grain-free and uses beet pulp, soy hulls and oils for energy.
Fibromega Cubed (Meunerie Benjamin)
Complete FeedComplete Feed
Coat QualityCoat Quality
FiberFiber
Gut HealthGut Health
Fibromega Cubed from Meunerie Benjamin is a complete feed that is high in fiber. It is intended to help with gastric health, coat and hoof health, and immunity.
Finger Lakes 12:7 (Poulin Grain)
Complete FeedComplete Feed
GrainsGrains
PerformancePerformance
ProteinProtein
Finger Lakes 12:7 by Poulin Grain is a textured feed intended for race horses. It contains corn, oats, and vitamin and mineral pellets. It supplies 12% crude protein, 7% fat, and 8% fiber.
Finisher 14 (McCauley’s Equine Formulas)
Coat QualityCoat Quality
FatFat
FoalFoal
Weight IssuesWeight Issues
Finisher 14™ is a textured feed designed for performance horses and preparing sale horses. It provides high levels of vegetable oil and beet pulp to promote a healthy coat appearance.
Finishing Touch (Masterfeeds)
Coat QualityCoat Quality
EnergyEnergy
FatFat
Weight IssuesWeight Issues
Masterfeeds Finishing Touch is a high-fat pelleted horse supplement that is used to promote weight gain or to provide fat as an energy source. It can be top-dressed on feed to increase the calorie density of the diet.
Fire-Fighter Non-GMO (Daily Dose Equine)
Easy KeeperEasy Keeper
HealthHealth
NutrientsNutrients
Weight IssuesWeight Issues
Fire-Fighter Non-GMO by Daily Dose Equine is a low NSC (10%) forage balancer intended for picky eaters needing to lose weight and horses with sensitive stomachs.
Fit & Fibre – Pelleted (Brooks Feeds)
Complete FeedComplete Feed
FatFat
FiberFiber
NutritionNutrition
Fit and Fibre is a high fat and fibre pelleted feed from Brooks Performance Horse Feeds. It contains a minimum of 6.50% fat and a maximum of 20% fibre with an NSC of 32.4% determined by independent testing. It is listed as a controlled NSC feed.
Fit & Fibre – Textured (Brooks Feeds)
Complete FeedComplete Feed
FatFat
FiberFiber
NutritionNutrition
Fit and Fibre is a high-fat and fibre textured feed from Brooks Performance Horse Feeds. This feed is meant to provide energy for horses in light to moderate work.
Foal & Weanling (McCauley’s Equine Formulas)
FoalFoal
GrowthGrowth
Gut HealthGut Health
HealthHealth
McCauley's Foal & Weanling is a pelleted feed for foals and growing horses. It is formulated to support gut development and to help transition foals from milk to feed.
Foal Balancer Milk Pellets (Seminole)
FoalFoal
GrowthGrowth
ProbioticProbiotic
YeastYeast
Seminole Foal Balancer Milk Pellets is a milk replacer and creep feed intended for nursing and orphan foals. It can also be fed to lactating mares and performance horses. This feed contains probiotic and yeast culture.
Foal Foundation (Tribute Equine)
FoalFoal
GrowthGrowth
PrebioticPrebiotic
ProbioticProbiotic
Tribute Foal Foundation™ is a milk-based pellet for foals up to three months of age to supplement the nutrients provided in mare's milk. The smaller pellet size helps to transition the foal to solid feeds.
Foal Milk Bits (Hoffman’s Horse Products)
FiberFiber
FoalFoal
HealthHealth
NutritionNutrition
Foal Milk Bits from Hoffman's Horse Products is a pelleted feed for foals. Foal Milk Bits is intended to supplement mare's milk. Foal Milk Bits may provide extra nutrition to foals who require additional calories.
Foal Milk Replacer (Hoffman’s Horse Products)
FatFat
FoalFoal
HealthHealth
NutritionNutrition
Foal Milk Replacer from Hoffman's is intended to replace or supplement a mare's milk. This milk replacer is highly palatable and intended to meet growing foals requirements.
Foal Starter (Buckeye)
EnergyEnergy
FoalFoal
PrebioticPrebiotic
ProteinProtein
Buckeye Foal Starter is a milk-based pellet that can be used as a free-choice transition or creep feed for foals under three months of age. It provides digestible fibre and protein sources.
Foal-Aide Paste (Buckeye)
FoalFoal
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Foal-Aide Paste by Buckeye is a paste supplement intended for foals and growing horses that contains minerals, vitamins, and antioxidants to support energy metabolism and growth.
Formula 2 Equine Supplement (Dr. Reeds) – [Discontinued]
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Dr. Reeds Formula 2 is a now-discontinued vitamin/mineral supplement for horses with higher NSC content than Formula 1. This supplement used a combination of organic and inorganic trace minerals and contained wheat and molasses.
Formula E and Se (DAC)
HealthHealth
ImmunityImmunity
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Formula E and Se by DAC is a powdered vitamin and mineral supplement designed to support muscle and immune function. It is formulated with 1250 IU Vitamin E.
Fort-EQ – Celebrite (La Coop)
AntioxidantAntioxidant
HealthHealth
Mineral BalanceMineral Balance
VitaminsVitamins
Fort-EQ is a pelleted equine supplement produced by La Coop from Québec, Canada. It is advertised to provide major minerals, minor elements, vitamins, and amino acids for horses.
Fortifiant Liberte (Nature Belisle)
HealthHealth
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Fortifiant Liberte by Nature Belisle is a pelleted vitamin and mineral supplement. It is intended for horses and ponies of all ages and work levels.
Fortify (Dove Performance Nutrition)
Mineral BalanceMineral Balance
NutrientsNutrients
Ration BalancerRation Balancer
VitaminsVitamins
Fortify from Dove Performance Nutrition is a pelleted feed ration for horses. It contains vitamins, minerals, protein, fiber and fat.
Fortify (Excel Equine Feeds)
FiberFiber
HealthHealth
Mineral BalanceMineral Balance
NutritionNutrition
Fortify from Excel Equine Feeds is a textured feed intended for horses in all stages of life. This feed contains 13% protein and 8% fat. Fortify is intended for horses in any level of work.
Foundation Cube (Hallway Feeds)
FiberFiber
Hay StretcherHay Stretcher
NutritionNutrition
ProteinProtein
Foundation Cube by Hallway Feeds is a cubed feed intended for growing and mature horses. It is a fortified feed that can be fed in amounts up to 18 lbs (8 kg) per day
Free Balance 12:12 Vitamin & Mineral (Purina)
HealthHealth
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Free Balance 12:12 Vitamin & Mineral from Purina is a granulated mineral supplement. This supplement is intended for horses who are not receiving a balanced concentrate feed.
Free Choice (Doctor’s Choice Supplements)
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Free Choice by Doctor's Choice Supplements is a vitamin and mineral supplement intended for horses strictly on pasture or forage. It contains ingredients such as calcium carbonate, salt, and monocalcium phosphate.
Freestyle Performance (Daily Dose Equine)
Caloric EnergyCaloric Energy
FatFat
FiberFiber
PerformancePerformance
Freestyle Performance by Daily Dose Equine is a textured feed that is higher in fat and fibre than Sweet ‘n Safe. It is intended for performance horses. It is also known as Trail Mix.
Full Stride (Pureform)
Hoof HealthHoof Health
JointsJoints
SeniorSenior
Skin + HairSkin + Hair
Pureform Full Stride is a joint and bone supplement for horses containing MSM, Glucosamine, DMG, amino acids, vitamins and minerals. The formula is advertised to maintain cartilage, tendons, muscle, skin, hair and hooves.
Full Support Mini (Pureform)
DigestionDigestion
JointsJoints
Mineral BalanceMineral Balance
VitaminsVitamins
Pureform Full Support Mini is a vitamin/mineral supplement intended for miniature horse breeds. It contains ingredients to support joint health, B-vitamins, as well as organic and inorganic minerals.
Futurity Blend 14 (Woody’s Feed)
BroodmareBroodmare
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
LactationLactation
Woody's Futurity Blend 14 is a high starch feed with 14% protein and 4.5% fat, targeted to broodmares and foals. It is formulated to support gestation, lactation and growth.
Game Changer Plus (OE Nutraceuticals)
AntioxidantAntioxidant
ImmunityImmunity
JointsJoints
MuscleMuscle
Game Changer Plus by OE Nutraceuticals is a powdered supplement designed to support joint and muscle health by helping to reduce inflammation.
Gastro Plus (Havens Horsefeed)
Amino AcidAmino Acid
Gut HealthGut Health
Mineral BalanceMineral Balance
VitaminsVitamins
Gastro Plus by Havens Horsefeed is a gut health supplement for all horses and ponies at all work levels. It contains alfalfa and a blend of buffers intended to neutralize stomach acid.
GastroBalance Plus (Enviro Equine)
AntioxidantAntioxidant
Gut HealthGut Health
Hoof HealthHoof Health
Organic Trace MineralsOrganic Trace Minerals
GastroBalance Plus by Enviro Equine is a gastrointestinal support supplement that includes Alltech-chelated organic trace minerals. It is intended to support overall GI tract function, the immune system, and general hoof and coat health in horses
GastroBalance Plus Paste (Enviro Equine)
Gut HealthGut Health
HealthHealth
PerformancePerformance
StressStress
GastroBalance Plus Paste by Enviro Equine is a gut health supplement intended to support horses during stress.
General Purpose Supplement (NAF Equine)
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
General Purpose Supplement from NAF Equine is intended to be added to a forage-based diet to supply extra vitamins and minerals. This supplement is intended for all horses and ponies.

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