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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.
Stable Mix Futurity (Elk Grove Milling)
GrowthGrowth
PerformancePerformance
PrebioticPrebiotic
ProbioticProbiotic
Stable Mix Futurity by Elk Grove Milling is a pelleted feed intended for young horses in training.
Stable Mix GC (Elk Grove Milling)
Complete FeedComplete Feed
HealthHealth
JointsJoints
NutrientsNutrients
Stable Mix GC by Elk Grove Milling is a complete pelleted feed containing glucosamine and chondroitin. It is intended for horses that show signs of arthritis.
Stable Mix Lite (Elk Grove Milling)
Complete FeedComplete Feed
HealthHealth
Low NSC FeedsLow NSC Feeds
NutrientsNutrients
Stable Mix Lite by Elk Grove Milling is a high fiber feed containing less than 12% NSC. It is intended for easy keepers, or horses needing low sugar and starch diets.
Stabul 1 (Anderson Feed Co)
Easy KeeperEasy Keeper
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
Weight IssuesWeight Issues
Stabul™ 1 is a low-starch (5%) and low-sugar (5%) feed intended for easy keepers and horses, ponies and mules with metabolic concerns. It is corn, oats and molasses-free.
Stabul 1 Plus (Anderson Feed Co)
ExerciseExercise
Metabolic SyndromeMetabolic Syndrome
NutritionNutrition
Weight IssuesWeight Issues
Stabul™ 1 Plus is a low-starch (5%) and low-sugar (5%) feed intended for horses that are in work or hard keepers. It is designed for horses with metabolic concerns to provide higher energy density.
Stake Horse (Woody’s Horse Nutrition)
Competition HorsesCompetition Horses
DigestionDigestion
FiberFiber
PerformancePerformance
Stake Horse by Woody’s Horse Nutrition is a beet-based 9% fat and 13% protein feed intended for racehorses. It is made with molasses, oats, barley, and beet pulp. This horse is intended for racehorses or performance horses.
Stallion Max (Hallway)
Caloric EnergyCaloric Energy
NutritionNutrition
Omega 3-6-9Omega 3-6-9
StallionStallion
Stallion Max from Hallway is a fortified high-fat, high-fibre feed formulated for stallions. This feed has added omega-3 fatty acids. Stallion Max contains 14% protein, 6% fat, and 12% fibre. It is recommended to start feeding 'Stallion Diets' 60 to 90 days before breeding season begins.
Staminoats (Hallway)
BroodmareBroodmare
GrowthGrowth
LactationLactation
NutritionNutrition
Staminoats from Hallway is a cubed feed fortified with Stamm 30, formulated for broodmares and young growing horses. This feed provides 14% protein, 3% fat, and 11% fibre.
Stamm 30 (Hallway)
BroodmareBroodmare
FoalFoal
GrowthGrowth
StallionStallion
Stamm 30 from Hallway is a vitamin and mineral pellet formulated for growing, reproducing, recreational and performance horses. This can be fed alone to easy keepers, or used to top dress feed for horses not getting the full feeding rate of concentrate feeds. Stamm 30 is used in other Hallway feeds as the source of vitamins and minerals.
Starch Wise (ProElite)
Gut HealthGut Health
NutritionNutrition
PerformancePerformance
SeniorSenior
ProElite Starch Wise is a pelleted horse feed with a maximum 14.5% NSC. It is formulated with moderate levels of starch and sugar for mature show and performance horses.
Steady Energy Formula (Bartlett Milling) [Discontinued]
EnergyEnergy
FatFat
Grain FreeGrain Free
PerformancePerformance
Bartlett Steady Energy Formula is a pelleted feed intended for mature horses that require lower levels of energy in their diet. It provides 12% protein and 6% fat.
Step (Vita Vet Labs)
Hoof HealthHoof Health
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Step by Vita Vet Labs is a supplement intended to support healthy hoof growth in horses.
Step 1 Start Right (Trouw Nutrition)
Complete FeedComplete Feed
FoalFoal
GrowthGrowth
LactationLactation
Step 1 Start Right is an extruded feed formulated to meet the nutritional demands of lactating broodmares, foals and weanlings. It can be fed to growing horses up to one year of age.
Step 2 Peak Performance – Sport (Trouw Nutrition)
Complete FeedComplete Feed
FatFat
PerformancePerformance
Weight IssuesWeight Issues
Step 2 Peak Performance - Sport by Trouw is an extruded, high-fat feed formulated to meet the energy demands of horses in heavy work, stallions, growing horses, and hard keepers. It provides 14% protein and 10% fat from vegetable oils.
Step 2 Peak Sweet (Trouw Nutrition) [DISCONTINUED]
Complete FeedComplete Feed
ExerciseExercise
FlavorFlavor
GrowthGrowth
Step 2 Peak Sweet is a textured, high-energy feed for horses in heavy work, stallions, growing horses, and hard keepers. It contains 14% protein and 10% fat.
Step 3 Classic Sweet (Trouw Nutrition)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
FlavorFlavor
Weight IssuesWeight Issues
Step 3 Classic Sweet is a textured sweet feed for mature horses in light to moderate work. It contains whole oats and added sugars to improve palatability.
Step 3 GenAPro (Trouw)
Complete FeedComplete Feed
FiberFiber
Hay StretcherHay Stretcher
Low NSC FeedsLow NSC Feeds
Trouw GenAPro (GAP) is an alfalfa-based, high fibre and low NSC feed with less than 10% sugar and starch content. GenAPro is designed as a partial or total hay replacer when quality forage is limited.
Step 4 Complete – Rocky Mountain Crunch (Trouw Nutrition) [DISCONTINUED]
DigestionDigestion
FiberFiber
Hay StretcherHay Stretcher
Ration BalancerRation Balancer
Step 4 Complete Rocky Mountain Crunch is an extruded, high-fibre feed used to partially replace forage. The kibbles contain 14% protein as well as essential vitamins and minerals.
Step 4 Low Sugar Lite (Trouw Nutrition)
Complete FeedComplete Feed
DigestionDigestion
FiberFiber
Low NSC FeedsLow NSC Feeds
Step 4 Low Sugar Lite by Trouw Nutrition is a high-fibre pelleted feed intended for horses who are prone to founder, sugar sensitivities, insulin resistance and metabolic disorders.
Step 5 Top Up Mineral (Trouw Nutrition)
HealthHealth
Mineral BalanceMineral Balance
Ration BalancerRation Balancer
VitaminsVitamins
Step 5 Top Up Mineral by Trouw Nutrition is a loose mineral supplement intended for horses who need additional vitamins and minerals in their diet.
Step 6 Senior (Trouw Nutrition)
Complete FeedComplete Feed
DentalDental
SeniorSenior
Weight IssuesWeight Issues
Step 6 Senior is a pelleted and extruded feed intended for senior horses and hard keepers. It contains 5% fat, 16% protein and can be given to senior horses with dental issues.
Step 7 Top Up Supplement (Trouw Nutrition)
Easy KeeperEasy Keeper
Gut HealthGut Health
Ration BalancerRation Balancer
VitaminsVitamins
Step 7 Top Up Supplement by Trouw Nutrition is a ration balancer intended to be used when horses are not consuming a complete feed, such as corn, oats or barley. It can be used for over-conditioned horses, horses on pasture and horses with low energy requirements.
Step 8 High Fat (Trouw Nutrition)
Complete FeedComplete Feed
FatFat
PerformancePerformance
Weight IssuesWeight Issues
Step 8 High Fat - Cool Energy by Trouw Nutrition is a pelleted feed intended for performance horses or horses that required fat-sourced energy.
Step Right Horse Mineral (Trouw Nutrition) [DISCONTINUED]
Gut HealthGut Health
HealthHealth
Ration BalancerRation Balancer
VitaminsVitamins
Step Right Horse Mineral (formerly Step 7b Pro Equine Supplement) is a concentrated mineral and vitamin supplement for horses in a loose powdered format. It is intended for horses that are not consuming complete feed, horses on pasture, or easy keepers.
Stock Builder (Star Milling Co)
ExerciseExercise
GrowthGrowth
MuscleMuscle
ProteinProtein
Stock Builder by Star Milling Co is a high protein supplement formulated with ingredients such as soybean meal, ground cereal grains and whey. It contains a minimum of 25% protein and no added minerals and vitamins.
Strategy® Professional Formula GX (Purina Mills)
Complete FeedComplete Feed
ExerciseExercise
GrowthGrowth
HealthHealth
Strategy Professional Formula GX is a pelleted concentrate horse feed for all life stages. It provides 14% crude protein, 6% crude fat and 12.5% fiber.
Stretch Horse Pellets (West Feeds)
Caloric EnergyCaloric Energy
FatFat
GrainsGrains
ProteinProtein
Stretch Horse Pellets by West Feeds is a higher energy feed containing a minimum of 14% protein and a minimum of 6% fat content. This feed includes ingredients such as grain products, plant protein, and forage products.
Strucomix Original (Cavalor)
Complete FeedComplete Feed
FiberFiber
HerbHerb
Organic Trace MineralsOrganic Trace Minerals
Strucomix Original by Cavalor is an oat-free, corn-free and molasses-free feed for horses in maintenance to moderate work. A textured and balanced feed for horses rich in fiber and herbs.
Strucomix Senior (Cavalor)
Complete FeedComplete Feed
DigestionDigestion
FiberFiber
SeniorSenior
Strucomix Senior by Cavalor is a high-fibre feed formulated with puffed and extruded grains to improve digestibility. It contains 14% protein that help support weight and muscle maintenance.
Stud Balancer (Heygates Feeds)
BroodmareBroodmare
DigestionDigestion
FoalFoal
StallionStallion
Stud Balancer is a high-protein ration balancer intended for breeding stock, such as broodmares, stallions, and young horses. It is meant to be fed alongside forages or other feeds.
SU-PER Anti-Oxidant Powder (Gateway Products)
AntioxidantAntioxidant
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
SU-PER Anti-Oxidant Powder by Gateway Products is an anti-oxidant supplement anti-oxidant to support general health, energy production, and immune response for horses under stress or recovering from illness.
SU-PER Cell Builder Liquid (Gateway Products)
Blood CellsBlood Cells
CirculationCirculation
HealthHealth
VitaminsVitamins
SU-PER Cell Builder Liquid by Gateway Products is a supplement to support stamina, endurance, and blood cell health. It is a high-iron supplement that supports normal red blood cell production and helps promote healthy cells with high hemoglobin content.
SU-PER E-Se Liquid (Gateway Products)
AntioxidantAntioxidant
ImmunityImmunity
Mineral BalanceMineral Balance
VitaminsVitamins
SU-PER E-Se Liquid by Gateway Products is a liquid supplement that supports immune function, muscle function, and optimal recovery. Vitamin E and selenium are good antioxidants to aid in the recovery of sore muscles.
SU-PER E-Se Pellets (Gateway Products)
AntioxidantAntioxidant
ImmunityImmunity
Mineral BalanceMineral Balance
VitaminsVitamins
SU-PER E-Se Pellets by Gateway Products is a supplement that supports immune function, muscle function, and optimal recovery. Vitamin E and selenium are good antioxidants to aid in the recovery of sore muscles.
SU-PER E-Se Powder (Gateway Products)
AntioxidantAntioxidant
ImmunityImmunity
Mineral BalanceMineral Balance
VitaminsVitamins
SU-PER E-Se Powder is a supplement that supports immune function, muscle function, and optimal recovery. Vitamin E and selenium are good antioxidants to aid in the recovery of sore muscles.
SU-PER Form Pellets (Gateway Products)
HealthHealth
Mineral BalanceMineral Balance
ProbioticProbiotic
VitaminsVitamins
SU-PER Form Pellets by Gateway Products is a vitamin and mineral supplement that provides all the necessary nutrients. This supplement also includes additional amino acids and electrolytes and is meant for horses of all life stages.
SU-PER ImmunoBOOST Powder (Gateway Products)
AntioxidantAntioxidant
HerbHerb
ImmunityImmunity
NutrientsNutrients
SU-PER ImmunoBOOST Powder by Gateway Products is an immune supplement of anti-oxidants, vitamins and minerals, and herbal extracts. This supplement is for seniors, performance, and horses under consistent stress.
SU-PER LaminAid Powder (Gateway Products)
Amino AcidAmino Acid
HerbHerb
Hoof HealthHoof Health
VitaminsVitamins
SU-PER LaminAid Powder by Gateway Products is a circulation supplement designed for horses suffering from laminitis/founder or at risk. This supplement helps to increase blood flow, support inflammatory responses, and provide nutrients to damaged tissues.
SU-PER Meta-Balance Powder (Gateway Products)
Hoof HealthHoof Health
MetabolismMetabolism
Metabolic SyndromeMetabolic Syndrome
NutrientsNutrients
SU-PER Meta-Balance Powder is a supplement meant to support blood-glucose levels for healthy metabolic regulation. This supplement provides vitamins and minerals that help to maintain proper metabolism.
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.

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