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Organic Selenium - Feed Ingredient

Organic selenium refers to selenium that is bound to organic compounds, typically in the form of selenomethionine or selenized yeast. Unlike inorganic selenium sources such as sodium selenite or sodium selenate, organic selenium is more bioavailable and efficiently utilized by the horse’s body. It is also considered a safer source of selenium.

Selenium is an essential trace mineral required for antioxidant function, immune support, and muscle integrity. In equine diets, organic selenium is often preferred due to its higher absorption rate and incorporation into proteins, allowing for more sustained selenium availability compared to inorganic forms.

While essential for horses and necessary in diets where soils are selenium deficient, excessive selenium intake can be toxic. Selenium supplementation should be carefully managed to prevent toxicity while ensuring adequate intake for optimal health.

The following equine feeds, supplements and products contain Organic 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.
Natural Digestive Support – BioEquine Supplement
DigestionDigestion
Mineral BalanceMineral Balance
ProbioticProbiotic
Toxin BinderToxin Binder
BioEquine Natural Digestive Support is an equine gut health supplement containing probiotics, toxin binders, Diatomaceous Earth, minerals, vitamins and amino acids.
Naturals Pelleted Horse Feed (Triple Crown)
Complete FeedComplete Feed
EnergyEnergy
HealthHealth
ProteinProtein
Triple Crown Naturals is a pelleted horse feed made with GMO-free ingredients and without corn, soybean, or molasses. Energy sources include alfalfa meal, ground oats, wheat middlings, and flaxseed.
Northwest Horse Supplement (NW)
AntioxidantAntioxidant
Mineral BalanceMineral Balance
PerformancePerformance
VitaminsVitamins
Northwest Horse Supplement is a supplement containing trace minerals, yeast, antioxidants and vitamins. It is intended for stallions and performance, maintenance, and halter horses.
Nutrequin Elite (Equistro)
HealthHealth
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Nutrequin Elite is a vitamin, mineral, and amino acid supplement formulated for performance horses as well as lactating and pregnant mares.
Nutrimix Plus (Stride Animal Health) – [Discontinued]
Coat QualityCoat Quality
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
Nutrimix Plus from Stride Animal Health is a vitamin and mineral supplement that can support healthy hooves. It can also contribute to hair and coat quality.
Oatena (Purina)
Caloric EnergyCaloric Energy
ExerciseExercise
HealthHealth
NutrientsNutrients
Purina Oatena is a textured feed intended for active pleasure horses in boarding stables and riding schools. It supplies moderate protein (13%) and low fat (4%) from ingredients such as whole oats, flaked barley, wheat, soy hulls, and soybean oil.
OBS Easy 10 (Ocala Breeders’ Feed and Supply)
Easy KeeperEasy Keeper
FiberFiber
NutritionNutrition
Weight IssuesWeight Issues
OBS Easy 10 by Ocala Breeder’s Supply (OBS) is a complete pelleted feed intended for easy-keepers and horses at maintenance. It provides lower protein (10%) and fat (3.5%) content and is composed of corn, oats, wheat middlings, soybean hulls, alfalfa meal and molasses.
OBS Generation (Ocala Breeders’ Feed and Supply)
FatFat
Mineral BalanceMineral Balance
ProteinProtein
VitaminsVitamins
OBS Generation is a complete pelleted feed formulated for horses at maintenance. It is made with wheat middlings, oats and corn, and provides 14% protein and 6% fat.
OBS Gest-O-Lac (Ocala Breeders Feed & Supply)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
OBS Gest O Lac is a textured horse feed for broodmares in late gestation, lactating mares, and foals. It contains high protein and fat content to support growth and lactation. Yeast culture is added to help support gut health.
OBS Hi-Amo Plus (Ocala Breeders Feed & Supply)
Amino AcidAmino Acid
ExerciseExercise
GrowthGrowth
LactationLactation
OBS Hi-Amo Plus is a textured concentrate feed designed to support growth and reproductive function. It contains added lysine, digestible fibre sources, and selenium yeast.
OBS Mane 10 (Ocala Breeders’ Feed and Supply)
Easy KeeperEasy Keeper
FiberFiber
Mineral BalanceMineral Balance
VitaminsVitamins
OBS Mane 10 is a complete textured feed intended for easy-keepers and pleasure horses. It contains 10% protein and 3.5% fat and contains oats, corn and wheat middlings.
OBS Pellet Plus (Ocala Breeders Feed & Supply)
ExerciseExercise
FoalFoal
GrowthGrowth
LactationLactation
OBS Pellet Plus is a pelleted horse feed with added lysine for horses in training, broodmares, and growing horses. Pellet Plus contains vegetable oil as a source of energy and selenium yeast to support immune and reproductive function.
OBS Performance Blend (Ocala Breeders Feed & Supply)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
Competition HorsesCompetition Horses
Weight IssuesWeight Issues
OBS Performance Blend is a textured horse feed targeted to yearlings and horses in heavy training or that require improvement in condition. It provides a higher energy density and fat content to support weight management.
OBS Professional Blend (Ocala Breeders Supply)
Competition HorsesCompetition Horses
ExerciseExercise
FatFat
PerformancePerformance
OBS Professional Blend is a complete textured feed intended for high-performance horses. It is formulated with oats, corn and beet pulp and contains 10% fat.
OBS Racing Blend (Ocala Breeders Feed & Supply)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
OBS Racing Blend is a horse feed formulated for racehorses. Racing Blend provides a higher energy density to meet the needs of horses in heavy training. This feed contains beet pulp and steam-crimped oats.
OBS Sport Feed (Ocala Breeders’ Feed and Supply)
Amino AcidAmino Acid
Caloric EnergyCaloric Energy
ExerciseExercise
PerformancePerformance
OBS Sport Feed is a complete feed intended for performance horses. It is formulated with wheat middlings, soybean hulls and alfalfa meal. It contains 13% protein and 10% fat.
Old Horse (Dunstan)
FiberFiber
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
NutrientsNutrients
Old Horse by Dunstan is a high fibre feed intended for older horses at increased risk of metabolic disorders.
Oleo Special (Purina)
Complete FeedComplete Feed
DigestionDigestion
FatFat
HindgutHindgut
Purina Oleo Special is an oiled textured feed for pleasure or performance horse that are housed in boarding stables. It provides 7% fat with ~22% NSC.
Omega Advantage (ProElite)
FatFat
GrowthGrowth
Omega 3-6-9Omega 3-6-9
PerformancePerformance
ProElite Omega Advantage is an extruded horse supplement providing 24% fat with added flax. It is intended to provide extra calories and aid in weight gain.
Omega Bran (McCauley’s)
FatFat
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
Omega Bran by McCauley's is a high fat (27.8%) supplement containing vitamins and minerals, it is intended for all horses.
OMG (Dove Performance Nutrition)
Mineral BalanceMineral Balance
NutrientsNutrients
Ration BalancerRation Balancer
VitaminsVitamins
OMG from Dove Performance Nutrition is a pelleted feed ration for horses. It contains vitamins, minerals, protein, fiber and fat.
Omolene Maternity 300 (Purina Canada)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Purina Omolene Maternity 300 is a textured horse feed intended for broodmares, nursing and growing foals. It provides higher amino acid content to support growth and development.
Omolene Progression 200 (Purina)
BroodmareBroodmare
Complete FeedComplete Feed
PerformancePerformance
StallionStallion
Omolene Progression 200 is a textured feed intended for performance horses, growing horses and gestating mares. It supplies 14% protein and 7% fat from ingredient sources including soybean meal, soybean oil, whole oats, flaked barley and extruded corn.
Omolene Senior Action (Purina)
ExerciseExercise
PerformancePerformance
Ration BalancerRation Balancer
SeniorSenior
Omolene Senior Action is a complete textured feed formulated for active senior horses. It provides 14% protein, which may support muscle tone in senior horses that are not receiving enough protein from their forage.
Omolene Sport Plus (Purina)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
Purina Omolene Sport Plus is a textured complete feed intended for horses in heavy work including racehorses. It provides 8% fat from vegetable oils and contains beet pulp as a high pectin fibre source.
Optimize (Uckele)
FiberFiber
Low NSC FeedsLow NSC Feeds
MetabolismMetabolism
NutrientsNutrients
Optimize is a pelleted ration balancer with a feeding rate of 1-2 lbs per day. It is formulated for horses needing a low starch and sugar diet, such as horses with metabolic disorders. The NSC content in this ration balancer is 7.8%
Optimum EQ 2.0 (BioStar)
Bone HealthBone Health
HealthHealth
Mineral BalanceMineral Balance
PerformancePerformance
Optimum EQ 2.0 by BioStar is a vitamin and mineral supplement containing amino acids and mineral proteinates.
Optimum Senior JS 2.0 (BioStar)
HealthHealth
JointsJoints
NutritionNutrition
RecoveryRecovery
Optimum Senior JS 2.0 by BioStar is a powdered vitamin and mineral supplement formulated to support joint health in senior horses. It contains glutamine as well as the omega-3 fatty acids EPA and DHA.
Orange Superior (DAC)
MetabolismMetabolism
Mineral BalanceMineral Balance
ProbioticProbiotic
VitaminsVitamins
Orange Superior is a vitamin and mineral supplement that can be given to any mature horse, and is meant to support metabolic functions, energy balance, and also provides probiotics.
Original 12 Textured (McCauley’s Equine Formulas)
BroodmareBroodmare
Complete FeedComplete Feed
LactationLactation
StallionStallion
Original 12 Textured is a palatable oat-based feed targeted to broodmares and stallions. It is formulated with added yeast and organic minerals. It is designed to promote healthy gut function.
Original 14 Pelleted (McCauley’s)
Feed EfficiencyFeed Efficiency
GrainsGrains
GrowthGrowth
NutritionNutrition
McCauley's Original® 14 Pelleted is a pelleted horse feed with 14% protein to meet the needs of breeding and growing horses. This oat-based formula contains 3.5% fat and 12% fibre.
Original 14 Textured (McCauley’s Equine Formulas)
Feed EfficiencyFeed Efficiency
GrowthGrowth
HealthHealth
LactationLactation
McCauley's Original 14 Textured is an oat-based feed for stallions, breeding, growing, and performance horses. It is fortified with organic minerals and contains yeast for digestive health.
Original 16 Textured (McCauley’s Equine Formulas)
BroodmareBroodmare
Feed EfficiencyFeed Efficiency
FoalFoal
LactationLactation
McCauley's Original 16 Textured is an oat-based horse feed for breeding and growing horses. It contains higher protein (16%) to meet the needs of growing yearlings and lactating broodmares.
Original® 12 Pelleted (McCauley’s Equine Formulas)
BroodmareBroodmare
Feed EfficiencyFeed Efficiency
Ration BalancerRation Balancer
StallionStallion
McCauley's Original® 12 Pelleted is a palatable and digestible oat-based feed for broodmares and stallions. It provides 12% protein, 12% fiber, 3.5% fat, and contains organic minerals.
Original® 16 Pelleted (McCauley’s Equine Formulas)
Feed EfficiencyFeed Efficiency
FoalFoal
GrowthGrowth
LactationLactation
Original® 16 Pelleted is an oat-based feed targeted to breeding horses and yearlings. It provides 16% crude protein and is formulated for growing horses.
OrSel-50 (Hestevard)
AntioxidantAntioxidant
HealthHealth
ImmunityImmunity
VitaminsVitamins
OrSel-50 by Hestevard is a powdered selenium plus vitamin E supplement, it is intended to support immunity and a healthy metabolism in horses and ponies with a vet diagnosed selenium deficiency.
Osceola 10 (Seminole)
Complete FeedComplete Feed
FlavorFlavor
Mineral BalanceMineral Balance
VitaminsVitamins
Seminole Osceola 10 is a textured feed with corn, oats, and molasses for mature pleasure horses with a high 48% NSC (sugar & starch) content. This feed contains yeast culture and antioxidants.
Osceola 12 (Seminole)
Complete FeedComplete Feed
FlavorFlavor
Mineral BalanceMineral Balance
VitaminsVitamins
Seminole Osceola 12™ is a textured grain-based feed with high NSC levels (44%) intended for mature pleasure horses. Energy sources include corn, oats, wheat, soybean meal and cane molasses.
Osceola 14 (Seminole)
Complete FeedComplete Feed
FlavorFlavor
Mineral BalanceMineral Balance
VitaminsVitamins
Seminole Osceola 14™ is a textured feed with higher protein levels for growing, breeding, or performance horses. It has a high NSC value of 39% from grain-based ingredients.
Parkmore Special Vitamin/Mineral Pelleted Supplement (Parkmore Supplements)
HealthHealth
NutrientsNutrients
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Parkmore Special Vitamin/Mineral Pelleted Supplement is a trace mineral and vitamin supplement designed for all ages and working classes of horses. It can be fed in addition to grain or on its own.
Pastime (McCauley’s Equine Formulas)
Feed EfficiencyFeed Efficiency
HealthHealth
NutritionNutrition
Ration BalancerRation Balancer
Pastime is an oat-based pelleted feed for adult horses at maintenance or in light work. It targets pleasure horses with lower energy density and fat content.
Pasture Lick (DAC)
HealthHealth
NutrientsNutrients
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Pasture Lick by DAC is a vitamin and mineral supplement lick for mature horses. It is formulated with Vitamin E, biotin, and yeast.
Patriot Pellet (Masterfeeds)
Easy KeeperEasy Keeper
MuscleMuscle
ProteinProtein
Ration BalancerRation Balancer
Masterfeeds Patriot Pellet is a complete pelleted feed intended for horses at maintenance or in moderate work. The pellets are fortified with minerals and vitamins and provide high protein (14%) and low fat (4.5%).
PegaVite (Equestrizone)
IngredientIngredient
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
PegaVite from Equestrizone provides essential daily vitamins and minerals to balance equine diets. It provides ingredients such as calcium carbonate and monocalcium phosphate that forage and concentrate grains may be lacking.
Pennwoods 13 to 36 Advanced (Pennwoods Equine)
FatFat
FoalFoal
GrowthGrowth
ProteinProtein
Pennwods 13 to 36 Advanced is a growth and performance supplement targeted to yearling and two-year-old horses. It contains a blend of proteins, fats, vitamins, and minerals.
Perfectly Senior Horse Summer Pellet (Kruse’s Perfection Brand)
FiberFiber
GrainsGrains
JointsJoints
SeniorSenior
Perfectly Senior Horse Summer Pellet by Kruse's Perfection Brand is a pelleted feed that is intended to be fed to senior maintenance, performance, and breeding horses. This feed is meant to be fed as a complete feed or supplemented with hay or pasture equivalent.
Perfectly Senior Horse Winter Pellet (Kruse’s Perfection Brand)
BroodmareBroodmare
Complete FeedComplete Feed
PerformancePerformance
SeniorSenior
Perfectly Senior Horse Winter Pellet by Kruse's Perfection Brand is a feed that intends to be fed to senior maintenance, performance, and breeding horses either as a complete feed or supplemented with hay or pasture equivalent.
Perfo EXT (Sollio Agriculture)
Competition HorsesCompetition Horses
HealthHealth
NutritionNutrition
Weight IssuesWeight Issues
Perfo EXT is a high-calorie extruded feed. This feed is intended for performance horses or horses who require additional calories.
Perfomix (Cavalor)
Complete FeedComplete Feed
Mineral BalanceMineral Balance
ProteinProtein
VitaminsVitamins
Cavalor Perfomix is a complete textured feed intended for active recreational and competition horses. It provides 11.5% protein and 4% fat from ingredients such as oats, wheat middlings, barley and soy hulls.
Perform Gold (Triple Crown)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
FatFat
FiberFiber
Perform Gold is a high energy density pelleted feed designed for performance horses. It provides 12.5% protein, 12% fat and 15.3% NSC, and contains a mixture of organic and inorganic minerals.

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