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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.
ABC’s Fortified G. R. P. (Advanced Biological Concepts)
HealthHealth
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
ABC's Fortified G.R.P. by Advanced Biological Concepts is a supplement intended for horses and ponies of all ages and work levels. It contains 10% protein, 3% fat, and 17% fibre.
ABC’s Fortified Equine Supplement (Advanced Biological Concepts)
HealthHealth
Mineral BalanceMineral Balance
ProbioticProbiotic
VitaminsVitamins
ABC's Fortified Equine Supplement is a pelleted supplement that intends to be fed as a ration balancer for all life stages of horses. It contains vitamins, minerals, and probiotics for nutrient absorption.
Accel Health and Wellness Formula (Vita Flex)
HealthHealth
Mineral BalanceMineral Balance
MuscleMuscle
VitaminsVitamins
Accel Health and Wellness Formula is a vitamin and mineral supplement for horses. It contains both organic and inorganic trace minerals.
Accel Lifetime (Vita Flex)
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Accel Lifetime is a vitamin and mineral supplement providing 18% crude protein. It contains a mix of organic and inorganic trace minerals.
Accelerate (Right Choice)
Coat QualityCoat Quality
FatFat
NutritionNutrition
Weight IssuesWeight Issues
Accelerate is a textured complete feed with 12% protein and 8% fat. It is formulated for performance horses with added yeast and a combination of organic and inorganic minerals.
Accelerate GH (Right Choice)
FatFat
Gut HealthGut Health
PrebioticPrebiotic
ProbioticProbiotic
Accelerate GH is a pelleted complete feed with 12% protein, 8% fat, and 24% NSC. It contains organic minerals as well as pre and probiotics for digestive support.
Achieve Performance Base (Pink Rose Organix)
Grain FreeGrain Free
Gut HealthGut Health
PerformancePerformance
Ration BalancerRation Balancer
Achieve Performance Base from Pink Rose Organix is a balancer that is intended for performance horses. It is grain free and is intended to assist with joint, gut, and muscle health and stress.
Achiever Foal Non-GMO (Daily Dose Equine)
BroodmareBroodmare
FoalFoal
GrainsGrains
Ration BalancerRation Balancer
Achiever Foal Non-GMO by Daily Dose Equine is a premixed forage balancer intended for broodmares in their last 2 months of pregnancy and for foals up to age 3. It contains minerals, vitamins, amino acids, and probiotics.
Achiever Non-GMO (Daily Dose Equine)
GrainsGrains
Gut HealthGut Health
Ration BalancerRation Balancer
VitaminsVitamins
Achiever Non-GMO by Daily Dose Equine is a textured feed that is intended to be fed as a forage ration balancer. It contains vitamins, minerals, amino acids, and probiotics meant for proper nutrient absorption.
Achiever-Lite (Daily Dose Equine)
GrainsGrains
Gut HealthGut Health
NutritionNutrition
Ration BalancerRation Balancer
Achiever-Lite by Daily Dose Equine is a textured feed that is intended to be fed as a forage ration balancer for easy keepers. It contains vitamins, minerals, amino acids, and probiotics for proper nutrient absorption.
Action Mix (Cavalor)
EnergyEnergy
NutrientsNutrients
PerformancePerformance
Action Mix by Cavalor is a textured feed that is intended for horses in light to moderate work. It contains prebiotics and is meant to support digestion.
Alam (McCauley’s Equine Formulas)
Caloric EnergyCaloric Energy
ExerciseExercise
Grain FreeGrain Free
Weight IssuesWeight Issues
McCauley's Alam is a pelleted feed with reduced levels of sugar and starches (NSC). It is formulated for horses that need to avoid grains, including horses prone to laminitis and horses with respiratory problems.
Alaska Equine Gold (Alaska Garden and Pet Supply)
HealthHealth
NutritionNutrition
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Alaska Equine Gold by Alaska Garden and Pet Supply is a pelleted feed formulated with enhanced vitamin and mineral supplementation to help balance the deficiencies of a forage-based diet.
Alfa Essentials (Tribute)
Low NSC FeedsLow NSC Feeds
NutrientsNutrients
Ration BalancerRation Balancer
VitaminsVitamins
Alfa Essentials is a ration balancer formulated for diets that contain greater than 50% legume forages such as alfalfa. It provides higher phosphorous than calcium to balance elevated levels of calcium.
Alfa Growth (Tribute Equine)
Complete FeedComplete Feed
FatFat
GrowthGrowth
LactationLactation
Tribute Alfa Growth® is a textured feed for growing horses and pregnant or lactating broodmares that are consuming 50% or more legume forages such as alfalfa hay.
Alfa Prime (Running Horse)
EnergyEnergy
ExerciseExercise
Feed EfficiencyFeed Efficiency
PerformancePerformance
Alfa Prime is a complete extruded feed intended for equine athletes with 14% protein and 8% fat. It is formulated with digestible fibre from alfalfa meal and soybean hulls and utilizes vegetable oil, rice bran and flaxseed as fat sources.
Alfa Pro (Hi-Pro Feeds)
FiberFiber
ForageForage
HealthHealth
NutrientsNutrients
Alfa Pro by Hi-Pro Feeds is a fortified, ground alfalfa cube designed for optimal equine nutrition. It is formulated to meet the dietary requirements of mature horses.
Alfa-Pro Elite (Hi-Pro Feeds)
ForageForage
Grain FreeGrain Free
Low NSC FeedsLow NSC Feeds
NutrientsNutrients
Alfa-Pro Elite by Hi-Pro Feeds is a fortified, ground alfalfa cube. It is grain-free and low in NSC, making it suitable for horses with metabolic conditions.
AlfaForce Yellow Tag (AlfaForce Equine)
Low NSC FeedsLow NSC Feeds
NutrientsNutrients
PerformancePerformance
ProteinProtein
AlfaForce Yellow Tag by AlfaForce Equine is a pelleted feed designed for all classes of horses. It is formulated with 16% protein, 3% fat and has a maximum non-structural carbohydrate level of 13.9%.
Alfalfa Advantage (ProElite)
Mineral BalanceMineral Balance
NutritionNutrition
Ration BalancerRation Balancer
VitaminsVitamins
ProElite Alfalfa Advantage is a low-feeding rate pelleted ration balancer intended to balance diets composed of alfalfa forages. It can be fed to all classes of horses.
Alfalfa Bermuda Blend Pellets (Ametza)
FiberFiber
ForageForage
Mineral BalanceMineral Balance
VitaminsVitamins
Alfalfa Bermuda Blend Pellets by Ametza is a pelleted feed that is meant to provide energy from sources such as alfalfa and Bermuda hay. It is intended for horses in light to moderate work.
Alfalfa Bermuda Hay Pellets (Ace Hi Feeds)
FiberFiber
ForageForage
Gut HealthGut Health
NutritionNutrition
Alfalfa Bermuda Hay Pellets can be used as a forage replacement for horses. This product also contains added vitamins and minerals. This feed is beneficial for older horses who have difficulty chewing.
Alfalfa Hay & Grain Pellets (Ace Hi Feeds)
FiberFiber
ForageForage
GrainsGrains
NutritionNutrition
Alfalfa Hay & Grain Pellets contain a blend of alfalfa forage and ground grain (barley or corn). This product contains a minimum of 12.5% protein, as well as added vitamins and minerals.
Alfalfa Hay Pellets (Ace Hi Feeds)
FiberFiber
ForageForage
Gut HealthGut Health
NutritionNutrition
Alfalfa Hay Pellets are a high protein forage source for horses. It contains a minimum of 14% protein and has added vitamins and minerals. This feed is beneficial for older horses, horses with bad teeth, or horses who are sensitive to breathing in dust from long-stem hay.
Alfalfa Hay Pellets (Kelley’s Feed)
FiberFiber
ForageForage
NutritionNutrition
ProteinProtein
Kelley's Feed Alfalfa Hay Pellets by is an alfalfa-based feed in a pelleted form with molasses for palatability. Hay pellets are recommended for horses with dental or respiratory issues. This forage replacement contains added vitamins and inorganic minerals.
Alfalfa Pellets (Ametza)
FiberFiber
ForageForage
Mineral BalanceMineral Balance
VitaminsVitamins
Alfalfa Pellets by Ametza is a pelleted feed that is intended to supply horses of all life stages with adequate energy. This feed contains alfalfa and is designed for maintenance or moderate to heavy working animals.
Alfalfa Support (Pureform)
AntioxidantAntioxidant
JointsJoints
Mineral BalanceMineral Balance
VitaminsVitamins
Pureform Alfalfa Support is a vitamin/mineral supplement designed for horses on diets containing high levels of alfalfa hay. It is suitable for all life stages and includes ingredients for joint health, such as glucosamine and MSM.
Alfalfa-Oat Hay Pellets (Ace Hi Feeds)
FiberFiber
ForageForage
NutritionNutrition
ProteinProtein
Alfalfa-Oat Hay Pellets by Ace Hi Feeds can be used as a forage replacement for horses. This product contains at least 12% protein, added molasses, and added vitamins and minerals.
Alfalfa/Bermuda Hay Pellets (Star Milling Co)
DentalDental
FiberFiber
ForageForage
NutritionNutrition
Alfalfa/Bermuda Hay Pellets by Star Milling Co are a blend of alfalfa and Bermuda hay designed as a forage replacement for horses. It contains 32% fiber and 11% protein in a 3/8 inch pellet with added molasses, vitamins, and minerals.
Alfalfa/Oat Hay Pellets (Kelley’s Feed)
FiberFiber
ForageForage
GrainsGrains
NutritionNutrition
Alfalfa/Oat Hay Pellets by Kelley's Feed is a pelleted forage replacement containing alfalfa and oat hay with added vitamins and minerals. Molasses is used for palatability and as an energy source.
AlfaMax RX (Alfamax Feed)
Complete FeedComplete Feed
DigestionDigestion
HealthHealth
Low NSC FeedsLow NSC Feeds
AlfaMax RX from Alfamax Feed is a complete pelleted feed. AlfaMax RX contains no soybean meal & is intended for horses' requiring a low NSC content (starch + sugars).
Align (OE Nutraceuticals)
Gut HealthGut Health
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Align is a vitamin and mineral supplement intended for performance horses. It contains prebiotics and probiotics which are meant to support gut health.
All Grain (Seminole)
Complete FeedComplete Feed
FlavorFlavor
GrainsGrains
NutritionNutrition
Seminole All Grain is a textured feed formulated with oats, corn, soybean meal and molasses. It contains 46% NSC, vitamins, chelated minerals, antioxidants, and yeast culture. This feed is intended for mature pleasure horses.
All In (Woody’s Horse Nutrition)
HealthHealth
Mineral BalanceMineral Balance
PerformancePerformance
VitaminsVitamins
All In by Woody’s Horse Nutrition is a pelleted vitamin and mineral supplement intended for horses on a forage-based or unfortified grain diet. It contains the limiting amino acids lysine, methionine, and threonine.
All in One (Herbs for Horses)
Gut HealthGut Health
HealthHealth
Mineral BalanceMineral Balance
PerformancePerformance
All in One from Herbs for Horses is intended to be a complete supplement for horses. All in One is intended to improve digestion, and rebuild muscle. This supplement contains added vitamins and minerals.
All Phase (Lifeline)
FiberFiber
Grain FreeGrain Free
Mineral BalanceMineral Balance
VitaminsVitamins
All Phase from Lifeline is a pelleted ration balancer intended for all horse types. This ration balancer contains 20% protein.
All Phase 20 – Pelleted (Brooks)
HealthHealth
Organic Trace MineralsOrganic Trace Minerals
Ration BalancerRation Balancer
VitaminsVitamins
All Phase 20 is a pelleted ration balancer designed to supply protein, vitamins, and minerals to diets not containing the recommended daily serving of complete feed. This pelleted feed also contains biotin and yeast culture to support digestive and hoof health.
All Stock Block (Sweet Country Feeds)
Mineral BalanceMineral Balance
NutritionNutrition
ProteinProtein
VitaminsVitamins
All Stock Block by Sweet Country Feeds is a protein supplement intended for free-choice consumption by multiple livestock species including horses. It contains 20% protein and 4.5% fat.
All Stock Sweet (West Feeds)
Caloric EnergyCaloric Energy
FlavorFlavor
GrainsGrains
NutritionNutrition
All Stock Sweet by West Feeds is for the maintenance needs of all livestock. It contains 10% protein content, 2.5% fat content, and 20% fiber content.
All-4-Feet (Dunstan)
FiberFiber
Hoof HealthHoof Health
Low NSC FeedsLow NSC Feeds
Organic Trace MineralsOrganic Trace Minerals
All-4-feet Dunstan is a low-starch, protein, high fibre formulation, designed to meet the nutrition requirements of horses that benefit from a low starch/low sugar diet due to various health conditions.
All-Around Complete Horse Nuggets (Livengood)
Complete FeedComplete Feed
FiberFiber
NutritionNutrition
ProteinProtein
All-Around Complete Horse Nuggets by Livengood contains a high level of protein and fibre. It is meant to be fed as a complete feed for all horses and ponies.
All-In-One Supplement (Extreme Equine Supplements)
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
NutritionNutrition
VitaminsVitamins
All-In-One Supplement by Extreme Equine Supplements is a comprehensive vitamin and mineral formula designed to support overall health and development in horses.
All-Phase (Kentucky Equine Research)
EnergyEnergy
Mineral BalanceMineral Balance
ProteinProtein
VitaminsVitamins
KER All-Phase is a pelleted ration balancer for horses in all life stages. It contains 26% protein and 3% fat.
All-Phase Balancer Formula (Bartlett Milling) [Discontinued]
GrainsGrains
NutritionNutrition
ProteinProtein
Ration BalancerRation Balancer
Bartlett All-Phase Balancer Formula is a grain balancer pellet intended for all classes of horses to supply protein, vitamins and minerals that may be lacking in the equine diet.
Alltrack (Textured) (Masterfeeds)
Gut HealthGut Health
Low NSC FeedsLow NSC Feeds
MuscleMuscle
PerformancePerformance
Alltrack (Textured) by Masterfeeds is a textured complete feed intended to support digestive and muscle health in high performance horses.
Alpaca Concentrate Pellet (Bar Ale)
HealthHealth
NutrientsNutrients
NutritionNutrition
VitaminsVitamins
Alpaca Concentrate Pellet is a concentrated pelleted feed intended to be fed to alpacas. It contains 18% protein, 2.9% fat, and 18.5% fiber.
Amber Grains Classic 12-4 Fiberwise (Coker Feed Mill)
DigestionDigestion
Easy KeeperEasy Keeper
FiberFiber
RecoveryRecovery
Amber Grains Classic 12-4 Fiberwise by Coker Feed Mill is a high-fiber (20%) textured feed intended for easy keepers and horses in recovery.
Amber Grains Classic 12-5 Pellet (Coker Feed Mill)
DigestionDigestion
HealthHealth
NutrientsNutrients
NutritionNutrition
Amber Grains Classic 12-5 Pellet by Coker Feed Mill is a pelleted feed intended for active horses not in heavy work.
Amber Grains Classic 12-6 Textured (Coker Feed Mill)
NutrientsNutrients
NutritionNutrition
PrebioticPrebiotic
ProbioticProbiotic
Amber Grains Classic 12-6 Textured by Coker Feed Mill is a textured feed intended to supplement hay. It is designed for active horses not in heavy work.
Amber Grains Classic 14-8 Pellet (Coker Feed Mill)
DigestionDigestion
Gut HealthGut Health
HealthHealth
ProbioticProbiotic
Amber Grains Classic 14-8 Pellet by Coker Feed Mill is a corn-free pelleted feed intended to support overall health in horses in moderate work and older horses with sensitive digestive systems.

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