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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.
SU-PER Oxy-Up Powder (Gateway Products)
EnergyEnergy
Omega 3-6-9Omega 3-6-9
PerformancePerformance
YeastYeast
SU-PER Oxy-Up Powder by Gateway Products is a supplement to support stamina and endurance. This supplement contains octacosanol, which supports the muscles' ability to use oxygen more efficiently and slow the exhaust of the horses' oxygen reserve.
SU-PER Show Coat Powder (Gateway Products)
Coat QualityCoat Quality
Mineral BalanceMineral Balance
Skin + HairSkin + Hair
VitaminsVitamins
SU-PER Show Coat Powder is a supplement that supports a healthy coat and skin. This supplement contains flaxseed meal as a source of essential fatty acids and additional vitamins and minerals for better nutrient absorption.
SU-PER Sound Plus Powder (Gateway Products)
FlavorFlavor
JointsJoints
NutrientsNutrients
VitaminsVitamins
SU-PER Sound Plus Powder by Gateway Products is a supplement to support and maintain healthy joint function, and it aids the structural integrity of connective tissues. This supplement contains elevated levels of MSM, hyaluronic acid, and chondroitin sulphate.
SU-PER StressEx Powder (Gateway Products)
CalmingCalming
ElectrolyteElectrolyte
RecoveryRecovery
StressStress
SU-PER StressEx Powder by Gateway Products is a supplement containing electrolytes that helps maintain a horse's normal body fluid levels. This supplement aids in supporting normal nerve and muscle function and helps prevent dehydration.
SU-PER Tie Deny Powder (Gateway Products)
AntioxidantAntioxidant
ExerciseExercise
MuscleMuscle
RecoveryRecovery
SU-PER Tie Deny Powder by Gateway Products is a supplement designed for performance horses to aid in the prevention of tying up. This supplement works to quickly eliminate lactic acid and increase energy stores in muscles to lessen lactic acid production.
Summer Heat (Woody’s Horse Nutrition)
Competition HorsesCompetition Horses
DigestionDigestion
FiberFiber
PerformancePerformance
Woody’s Summer Heat is a complete feed formulated for performance horses in heavy to intense work. It contains 12.5% protein and 7.0% fat, and is made with oats, barley, molasses and beet pulp.
Summit Active (Hubbard Feeds)
GrowthGrowth
Mineral BalanceMineral Balance
PerformancePerformance
VitaminsVitamins
Summit Active from Hubbard is a concentrated feed intended for performance horses. It provides 14% crude protein and contains grains, plant proteins, forage products, and vegetable oil.
Summit Senior (Hubbard Feeds)
Coat QualityCoat Quality
Gut HealthGut Health
NutrientsNutrients
SeniorSenior
Summit Senior from Hubbard is a complete feed intended for senior horses at maintenance with dental issues. It contains 14% crude protein and provides digestible energy and protein from mostly forage sources.
Summit® Classic + (Hubbard Feeds)
Complete FeedComplete Feed
Gut HealthGut Health
ImmunityImmunity
NutrientsNutrients
Summit Control+ from Hubbard is a concentrated feed intended for horses at multiple life stages and work levels. It contains 12% crude protein and energy sources from grain products, plant proteins, and forage.
Sunshine Plus Pelleted Horse Feed (Blue Seal)
Complete FeedComplete Feed
ProteinProtein
VitaminsVitamins
YeastYeast
Sunshine Plus is a high protein (30%) pelleted feed containing soybean meal and whey. Energy sources include cane molasses, wheat middlings, oil, and corn distillers grains.
Super 16 (Hallway)
BroodmareBroodmare
GrowthGrowth
LactationLactation
NutritionNutrition
Super 16 is a textured sweet feed fortified with Stamm 30 formulated for growing horses and broodmares in peak lactation. This feed uses whole and rolled grains with molasses as energy sources. Super 16 contains 16% protein, 3.5% fat, and 9% fibre.
Super Horse 12-12 (Manna Pro)
BroodmareBroodmare
Complete FeedComplete Feed
NutritionNutrition
PerformancePerformance
Super Horse 12-12 from Manna Pro is a textured sweet feed formulated for performance horses, broodmares, and stallions. Super Horse 12-12 contains 12% crude protein, 6% crude fat, and 7% crude fiber.
Super Horse Manna Senior (Manna Pro)
DentalDental
NutritionNutrition
SeniorSenior
Weight IssuesWeight Issues
Super Horse Manna Senior from Manna Pro is a beet pulp-based feed designed for senior horses. It contains 12.5% crude protein, 4% crude fat, 18% dietary starch, 7% sugars, and a mix of organic and inorganic trace minerals.
Super Horse Performance 10 (Manna Pro)
ExerciseExercise
GrainsGrains
NutritionNutrition
PerformancePerformance
Super Horse Performance 10 from Manna Pro is available as a pellet or a textured feed. Super Horse Performance 10 contains 10% crude protein, 6% crude fat, 7% crude fibre, and uses a mix of organic and inorganic trace minerals.
Super Staminoats (Hallway)
BroodmareBroodmare
GrowthGrowth
LactationLactation
NutritionNutrition
Super Staminoats from Hallway is a cubed feed fortified with Stamm 30, formulated for gestating or lactating broodmares, and young growing horses. This feed contains 16% protein, 3% fat, and 9.5% fibre.
Super Weight Gain (Horse Guard)
Coat QualityCoat Quality
HealthHealth
NutritionNutrition
Weight IssuesWeight Issues
Super Weight Gain by Horse Guard, is a supplement intended for healthy weight gain and enhancing coat condition. This supplement contains full-fat soybeans, prebiotics, probiotics and a vitamin mineral package.
SuperFibra Classic (Purina)
Complete FeedComplete Feed
Easy KeeperEasy Keeper
FiberFiber
NutrientsNutrients
Purina SuperFibra Classic is a chunked feed designed to add fibre to the diet with 12.5% protein and 2% fat. It is intended for use in maintenance to lightly working horses.
SuperFibra Integri-T (Purina Canada)
Complete FeedComplete Feed
ExerciseExercise
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
SuperFibra Integri-T is a complete feed designed for horses that require a reduced NSC diet and are at maintenance or in light work. SuperFibra Integri-T does not contain corn, oats, barley, or molasses.
SuperFibra Integri-T (Purina)
ExerciseExercise
FiberFiber
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
SuperFibra Integri-T has a low NSC content (10%) which can be fed to horses that require a low starch/sugar diet. SupreFibra Integri-T is a pelleted feed that is designed for horses who are insulin resistant or have a history of tieing up.
SuperFibra Plus (Purina)
BroodmareBroodmare
Complete FeedComplete Feed
FatFat
GrainsGrains
Purina SuperFibra Plus is a complete horse feed that provides ~21% NSC in a chunk format. It is formulated for horses at maintenance or moderate work, breeding horses and yearlings.
SuperFibra Ultra (Purina)
Complete FeedComplete Feed
ExerciseExercise
Gut HealthGut Health
Metabolic SyndromeMetabolic Syndrome
Purina SuperFibra Ultra is a pelleted feed intended for horses at all life stages. It contains 13% crude protein and 6% fat.
Superforce (Cavalor)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
EnergyEnergy
PerformancePerformance
Cavalor Superforce is a high-calorie textured feed intended for performance horses during competition. It provides energy from high NSC (sugar and starch) sources including oats and cane molasses.
SuperSport Amino Acid Supplement (Purina)
Amino AcidAmino Acid
PerformancePerformance
RecoveryRecovery
ToplineTopline
Purina® SuperSport® Amino Acid is a supplement intended for performance equine athletes. It provides 40% crude protein in a pelleted format to support muscle development.
Support One (Pureform)
AntioxidantAntioxidant
JointsJoints
Mineral BalanceMineral Balance
VitaminsVitamins
Pureform Support One is an equine supplement formulated to support joint, bone, and immune health. It contains Glucosamine, MSM, amino acids, complete vitamins, trace minerals, and anti-oxidants.
Supreme Horse Pride 18:18 Mineral (Harmony Equine)
HealthHealth
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Supreme Horse Pride 18:18 Mineral by Harmony Equine is a mineral supplement that contains and 1:1 ratio of 18% calcium and 18% phosphorus. It can be fed half and half with salt to promote consumption.
SUPREME™ 10 Pelleted Feed (BUCKEYE Nutrition)-[Discontinued]
Complete FeedComplete Feed
Gut HealthGut Health
HealthHealth
Ration BalancerRation Balancer
SUPREME™ 10 Pelleted Feed is a now-discontinued feed that provided 10% crude protein in a fortified grain mix. It was formulated to support the nutritional needs of mature horses.
SUPREME™ 14 Pelleted Feed (BUCKEYE Nutrition)
Complete FeedComplete Feed
Gut HealthGut Health
NutritionNutrition
Ration BalancerRation Balancer
SUPREME 14 Pelleted Feed by Buckeye Nutrition is a complete feed with 14% crude protein. It is formulated to support the nutritional needs of mature horses in light to moderate work, seniors, and the breeding herd. SUPREME 14 contains a total of 28% NSC.
Sweat-Up (Hygain)
ElectrolyteElectrolyte
HydrationHydration
RespiratoryRespiratory
Skin + HairSkin + Hair
Sweat-Up from Hygain is a supplement for horses that is intended to aid in coat and skin health, sweating, hydration, and breathing.
Sweet ‘N Safe (Daily Dose Equine)
Caloric EnergyCaloric Energy
FatFat
FlavorFlavor
GrainsGrains
Sweet 'N Safe by Daily Dose Equine is a textured feed for the average horse needing a higher caloric intake. It contains energy sources such as roasted whole oats, roasted whole barley, and roasted whole soybeans.
Sweet 10 (Excel Equine Feeds)
Easy KeeperEasy Keeper
EnergyEnergy
HealthHealth
NutritionNutrition
Sweet 10 is a textured feed from Excel Equine Feeds. This feed is intended for easy keepers or horses in light work.
Sweet 12% Textured (Agrimaster)
Gut HealthGut Health
Hoof HealthHoof Health
MuscleMuscle
Skin + HairSkin + Hair
Sweet 12% Textured by Agrimaster is a textured feed intended to support health and performance of all horse types.
Sweet Feed (Ritchie Smith – Harmony)
Competition HorsesCompetition Horses
DigestionDigestion
FiberFiber
NutrientsNutrients
Sweet Feed from Ritchie Smith's Harmony is a textured horse feed intended for horses in moderate to heavy work. Sweet Feed contains 12% crude protein and 4% fat.
Sweet Mix (Dunstan)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
PerformancePerformance
Weight IssuesWeight Issues
Sweet Mix by Dunstan is a highly palatable oat free textured feed that contains molasses. It is formulated to be a medium-energy feed intended for working horses or those requiring additional calories for weight gain.
Sweet Pellet (Seminole)
EnergyEnergy
FlavorFlavor
Mineral BalanceMineral Balance
NutritionNutrition
Seminole Sweet Pellet is a pelleted feed intended for horses, cattle, and goats. It contains 16% NSC, minerals, and antioxidants and is formulated with soybean hulls, grains, corn, and molasses.
Symphony (A Horse of Course)
Gut HealthGut Health
HealthHealth
Hoof HealthHoof Health
ImmunityImmunity
Symphony from A Horse of Course is a powdered equine supplement. Symphony is intended to promote healthy gut function. This supplement is formulated with biotin, methionine, and zinc intended to support hoof growth.
Synergize (Tribute)
FatFat
Gut HealthGut Health
Low NSC FeedsLow NSC Feeds
PerformancePerformance
Synergize by Tribute is a pelleted feed intended for hard-keepers and horses with a heavy workload that are sensitive to sugar and starch.
Synergy (Ark Nutrition)
Hoof HealthHoof Health
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Ark Nutrition Synergy is a concentrated mineral and vitamin premix containing 100% organic selenium and a blend of inorganic and organic trace minerals. It contains no molasses, fillers or artificial flavours.
Synergy (Thunderbrook)
Gut HealthGut Health
HealthHealth
HerbHerb
ImmunityImmunity
Synergy from Thunderbrook is a concentrated feed intended for all types of horses. Synergy contains prebiotics, herbs, and botanicals intended to support gut health.
Synergy Compete (SEB Equine)
HealthHealth
NutrientsNutrients
NutritionNutrition
PerformancePerformance
Synergy Compete by SEB Equine is a supplement intended to support overall health in performance horses.
TAB (Hallway)
Mineral BalanceMineral Balance
NutritionNutrition
ProteinProtein
VitaminsVitamins
Hallway Feed's TAB is a concentrated pelleted feed intended to balance the diet of horses fed alfalfa hay. It can be fed to horses at all life stages and has a lower feeding rate.
TDI 12% (TDI Horse Feeds)
Easy KeeperEasy Keeper
EnergyEnergy
HealthHealth
NutritionNutrition
TDI 12% from TDI Horse Feeds is an oat based, pelleted feed. TDI 12% is intended for adult horses in light to moderate work. This feed contains added vitamins, minerals, and yeast.
TDI-10 Supplement (Ace Hi Feeds)
BroodmareBroodmare
Easy KeeperEasy Keeper
NutritionNutrition
Ration BalancerRation Balancer
TDI-10 by Ace Hi Feeds is a soy-free feed intended for pregnant mares or easy keepers. It contains at least 10% crude protein and added vitamins and minerals. This feed is meant to be fed alongside a forage.
Teff Natural (Equis Feed)
FiberFiber
ForageForage
Mineral BalanceMineral Balance
VitaminsVitamins
Equis® Teff Natural is a horse feed made with teff grass hay that has a low sugar content. It contains canola meal, DDGS, beet pulp, soybean hulls, and added vitamins and minerals.
Textured Ration (Hoffman’s Horse Products)
Caloric EnergyCaloric Energy
DigestionDigestion
HealthHealth
NutritionNutrition
Textured Ration from Hoffman's is a textured feed for horses over 1 year of age. This feed is intended to increase fat absorption and digestion in horses. Hoffman's Textured Ration is 27.5% NSC.
Thorough-Bread (Sacate Pellet Mills)
FiberFiber
NutrientsNutrients
PerformancePerformance
ProteinProtein
Thorough-Bread from Sacate Pellet Mills is a pelleted feed meant for moderate to heavy working horses or nursing mares.
Tie Free 24 (Peak Performance Nutrients)
ElectrolyteElectrolyte
MuscleMuscle
PerformancePerformance
RecoveryRecovery
Tie Free 24 by Peak Performance Nutrients is a vitamin and mineral supplement that provides electrolytes to support horses prone to tying up. It contains vitamin E acetate, calcium carbonate, and sodium bicarbonate to help performance.
Tie-By (AniMed)
AntioxidantAntioxidant
ExerciseExercise
MuscleMuscle
RecoveryRecovery
AniMed TIE-BY is an antioxidant supplement for horses that routinely "tie-up." Ingredients include L-carnitine, magnesium, selenium, chromium and Vitamin E. This supplements supports the function of skeletal muscles and muscle enzyme activity.
Timothy Balance Cubes (Ontario Dehy)
FiberFiber
ForageForage
Gut HealthGut Health
Hay StretcherHay Stretcher
Timothy Balance® Cubes are a low-NSC feed made with timothy hay, beet pulp, minerals and amino acids. This feed is formulated for horses with metabolic concerns.
TNT For Horses (Dynamite Equine)
HealthHealth
ImmunityImmunity
NutritionNutrition
VitaminsVitamins
TNT For Horses from Dynamite Equine is a pelleted equine supplement. TNT For Horses is intended to support overall equine health. This supplement contains 18% protein and 8% fat.
Tonix (Sollio Agriculture)
Mineral BalanceMineral Balance
NutritionNutrition
Ration BalancerRation Balancer
VitaminsVitamins
Tonix is a complete pelleted vitamin, mineral, and protein supplement for horses receiving little or no feed. It is intended for maintenance and exercising horses.

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