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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.
LMF Super Supplement G NW (LMF Horse Feeds)
Mineral BalanceMineral Balance
Omega 3-6-9Omega 3-6-9
ProteinProtein
VitaminsVitamins
LMF Super Supplement G NW is a ration balancer that contains the essential vitamins and minerals to complement a forage diet. It is a low intake balancer that includes nutrient sources such as soybean meal, barley, and wheat.
LMF Super Supplement NW A (LMF Horse Feeds)
Easy KeeperEasy Keeper
HealthHealth
NutritionNutrition
Ration BalancerRation Balancer
LMF Super Supplement is a ration balancer from LMF Horse Feeds. This feed is intended for easy keepers, and contains vitamins and minerals to balance a forage based diet.
LMF Taco (LMF Horse Feeds)
Complete FeedComplete Feed
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
LMF Taco is a complete feed intended for horses of all classes. It contains 12% crude protein and 2.5% fat from timothy and alfalfa hay, corn and oats. This feed is made with cane molasses to encourage palatability.
Lone Star Trace MS-051120 (HorseTech)
Mineral BalanceMineral Balance
NutrientsNutrients
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Lone Star Trace MS-051120 is a custom vitamin and mineral supplement for horses. It contains milled flaxseed, added amino acids and organic trace minerals.
Longevity (McCauley’s Equine Formulas)
Gut HealthGut Health
SeniorSenior
StressStress
Weight IssuesWeight Issues
Longevity is a pelleted horse feed targeted to senior and stressed horses. It is designed to support body condition and gut health in senior horses.
Low ‘N Steady (Buckeye)
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
NutrientsNutrients
SeniorSenior
Low 'N Steady by Buckeye is a low NSC (8.5%) ration balancer intended for mature horses, and metabolic horses or ponies.
Low Molasses 12% (Brooks)
Easy KeeperEasy Keeper
NutritionNutrition
PerformancePerformance
SeniorSenior
Brooks 12% from Brooks is a textured horse feed. 12% Sweet Feed is intended for mature horses. This feed contains 12% crude protein and 4% fat.
Low Non-Structural Carbohydrate Feed (LMF Horse Feeds)
Amino AcidAmino Acid
Low NSC FeedsLow NSC Feeds
Mineral BalanceMineral Balance
VitaminsVitamins
This feed from LMF Horse Feeds contains low levels of starch and sugar. It is a pelleted feed that is meant to provide minerals, vitamins, amino acids, and omega fatty acids.
Low Starch (Triple Crown)
Complete FeedComplete Feed
Grain FreeGrain Free
Metabolic SyndromeMetabolic Syndrome
SeniorSenior
Triple Crown Low Starch is a pelleted feed containing a lower level of 13.5% NSC. It has no corn, molasses or alfalfa meal which can cause excitability in horses.
Low Starch Horse Feed (New Country Organics)
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
NutritionNutrition
ProteinProtein
Low Starch Horse Feed by New Country Organics is a textured feed intended for easy-keepers. It contains organic grains, probiotics, prebiotics, live yeast, and enzymes meant to support hindgut health.
Low Starch Omega Plus (Equine Advantage)
Caloric EnergyCaloric Energy
FatFat
FiberFiber
NutritionNutrition
Low Starch Omega Plus is intended for horses that need moderate to significant calories added to their diet. This diet is suitable for horses with Insulin Resistance, Cushing's Disease, and PSSM due to the low NCS.
LQ-Performance (DAC)
HealthHealth
NutrientsNutrients
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
LQ-Performance by DAC is a liquid vitamin and mineral supplement. It is formulated with chelated trace minerals, selenium, and chromium.
Luminance Fortified Equine Conditioning Supplement (Hallway Feeds)
Caloric EnergyCaloric Energy
Omega 3-6-9Omega 3-6-9
PerformancePerformance
Weight IssuesWeight Issues
Hallway Luminance is a fat supplement for horses that require additional body condition. It is formulated to add calories to the diet for performance horses and horses being prepared for sale.
M10 Balancer (McCauley’s)
Easy KeeperEasy Keeper
Mineral BalanceMineral Balance
SeniorSenior
VitaminsVitamins
M10 Balancer by McCauley's is a pelleted vitamin and mineral supplement intended for horses at maintenance or in light work.
M30 (McCauley’s)
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
PerformancePerformance
M30 by McCauley's is a supplement intended to balance the diet of all horse types.
Magnify (Dove Performance Nutrition)
FatFat
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Magnify from Dove Performance Nutrition is a pelleted ration that contains minerals, vitamins, and higher levels of fat. It is made for any class of horse.
Magnify HF – High Fat (D&D Nutrition)
FatFat
ForageForage
NutritionNutrition
Omega 3-6-9Omega 3-6-9
Magnify HF - High Fat by D&D Nutrition is a pelleted feed with an elevated level of fat, fibre, and protein intended for horses of all life stages. It contains energy sources such as alfalfa, rice bran, and coconut meal.
Maintenance Horse Feed (DuMOR)
Easy KeeperEasy Keeper
HealthHealth
ImmunityImmunity
NutritionNutrition
Maintenance Horse Feed from DuMOR is a pelleted feed intended for easy keepers. This feed contains added vitamins, minerals and probiotics intended for horses in any life stage.
Maintenance Pellets (Ritchie Smith – Harmony)
GrowthGrowth
HealthHealth
NutritionNutrition
Weight IssuesWeight Issues
Maintenance Pellets from Ritchie Smith's Harmony is a pelleted feed intended for growing horses and horses in moderate work. This feed contains 13% crude protein and 16% crude fibre. Maintenance Pellets are intended for horses who need additional calories.
Mare & Foal (Ace Hi Feeds)
BroodmareBroodmare
FoalFoal
GrowthGrowth
NutritionNutrition
Mare & Foal by Ace Hi Feeds is a supplemental feed intended for growing, gestating and lactating horses. It contains at least 16% protein from sources such as soybean meal, whey, and dried distillers grains.
Mare & Foal (Kelley’s Feed)
BroodmareBroodmare
FoalFoal
GrowthGrowth
NutritionNutrition
Mare & Foal by Kelley's Feed is a supplemental feed intended for growing, gestating, and lactating horses. It is a barley-based feed that contains at least 16% protein, added vitamins, and a blend of organic and inorganic minerals.
Mare & Foal (Seminole)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Seminole Mare & Foal™ is a textured feed designed for foals, weanlings, and late-gestation or lactating broodmares. This oat-based feed contains corn, digestible fibre, added lysine, and chelated trace minerals.
Mare Mineral (Dunstan)
BroodmareBroodmare
ImmunityImmunity
Mineral BalanceMineral Balance
NutritionNutrition
Mare Mineral by Dunstan is a pelleted feed containing vitamins and minerals. It is intended for pregnant mares.
Materna (Sollio Agriculture)
GrowthGrowth
HealthHealth
MareMare
NutritionNutrition
Materna is a pelleted feed intended for broodmares during lactation and gestation. This feed is intended to promote the development of the fetus. Materna contains 16% crude protein.
Materna TXT (Sollio Agriculture)
BroodmareBroodmare
EnergyEnergy
GrowthGrowth
HealthHealth
Materna TXT is a textured sweet feed intended for foals and lactating mares. This feed is intended to provide energy and protein to support milk production and foal growth.
Mature Horse (Bar Ale)
Complete FeedComplete Feed
JointsJoints
NutritionNutrition
SeniorSenior
Mature Horse is intended to support overall health and nutrient requirements for an adult to a senior horse. It contains glucosamine which is meant to support joint health.
Mature Horse Plus (Bar Ale)
Complete FeedComplete Feed
JointsJoints
NutritionNutrition
SeniorSenior
Mature Horse Plus is a pelleted feed formulated for older horses. It is intended to help maintain condition. It contains glucosamine and chondroitin to help support joint health.
Maxim Low-GI (Dunstan)
FiberFiber
HealthHealth
Low NSC FeedsLow NSC Feeds
NutritionNutrition
Maxim Low-GI by Dunstan is a high fibre feed formulated to be low in starch and sugar. It is intended for horses that do not do well on grain-based feeds.
Mega Dose (Horse Guard)
DigestionDigestion
Gut HealthGut Health
Mineral BalanceMineral Balance
VitaminsVitamins
Mega Dose by Horse Guard is a supplement that contains vitamins, minerals, and probiotics. It is intended to assist with digestion, gut health and hoof health.
Mega-Cell MVP – Pelleted Multi Vitamin and Mineral (Med-Vet)
HealthHealth
ProbioticProbiotic
Ration BalancerRation Balancer
VitaminsVitamins
MVP Mega-Cell is a pelleted vitamin and mineral supplement for horses formulated to balance grass hays and grain-based diets. It is also a source of amino acids and microbials.
Mega-Mag (Pellets) (MVP)
Amino AcidAmino Acid
Mineral BalanceMineral Balance
ProbioticProbiotic
VitaminsVitamins
Mega-Mag by MVP is a pelleted supplement designed for alfalfa hay/grain diets that provide vitamins, minerals, amino acids, and probiotics intended horses of all life stages.
Meganutril Ultra (Equina USA)
AntioxidantAntioxidant
HealthHealth
ImmunityImmunity
VitaminsVitamins
Meganutril Ultra from Equina USA is a mineral supplement for horses. Meganutril Ultra contains vitamins, amino acids, and yeast. This supplement is intended to balance nutritional deficiencies in horses.
Mellow Muscle (Sierra Gold)
CalmingCalming
Mineral BalanceMineral Balance
MuscleMuscle
VitaminsVitamins
Mellow Muscle by Sierra Gold is a powdered supplement for horses intended to aid horses suffering from PSSM. It contains vitamins, minerals, and amino acids which intend to support muscle growth.
Meta Safe (Hygain)
ImmunityImmunity
MetabolismMetabolism
Ration BalancerRation Balancer
Weight IssuesWeight Issues
Meta Safe from Hygain is a ration balancer pellet for horses. Meta Safe is intended for horses on a restricted diet or suffering from metabolic issues. This feed contains 6.5% NSC.
Meta-Librium (Equi-Force)
CalmingCalming
Metabolic SyndromeMetabolic Syndrome
Mineral BalanceMineral Balance
VitaminsVitamins
Meta-Librium is a supplement intended to help manage metabolic syndrome and insulin resistance in horses and ponies. It contains magnesium, lipoic acid, vitamin E and C, and L-Carnitine, enhancing insulin action.
Milestone Compete Horse Food (Muenster)
Coat QualityCoat Quality
Competition HorsesCompetition Horses
FatFat
MuscleMuscle
Complete Horse Food is intended to promote muscle growth and function. It is ideal for performance horses and breeding stock as extra calories and energy are needed.
Milestone Life Plus Horse Food (Muenster)
FatFat
FiberFiber
GrainsGrains
Omega 3-6-9Omega 3-6-9
Life Plus is a pelleted feed intended to provide additional energy and nutrients to all horses and ponies. It is also suitable for performance horse and breeding horses as they need extra essential nutrients.
Milestone Optimize Horse Supplement (Muenster)
FatFat
NutritionNutrition
Omega 3-6-9Omega 3-6-9
Weight IssuesWeight Issues
Optimize Horse Supplement is a high-fat feed intended to provide more energy to breeding horses and performance horses. It contains nutrient dense ingredients such as coconut meal and flaxseed.
Milestone Senior Horse Food (Muenster)
FatFat
FiberFiber
MareMare
SeniorSenior
Milestone Senior Horse Food is a pelleted feed intended for older horses in light to moderate work. It is suitable as a supplemental feed when forage availability is limited. It contains high fiber, low starch, alfalfa, coconut, flax, and algae meal.
Milk & Grow Pellets (Uckele)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Milk & Grow Pellets is a vitamin, mineral, probiotic, and amino acid pelleted supplement formulated for lactating and gestating mares as well as growing foals that have increased nutrient demands.
Min-A-Vite (Blue Seal) [DISCONTINUED]
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Min-A-Vite from Blue Seal is a vitamin and mineral supplement intended for horses and ponies of all ages and work levels. Min-A-Vite uses a mix of inorganic and organic trace minerals.
MinerEQ (Omega Alpha)
Hoof HealthHoof Health
Mineral BalanceMineral Balance
MuscleMuscle
VitaminsVitamins
MinerEQ by Omega Alpha is a powdered vitamin and mineral supplement for horses that provides essential minerals, trace elements, vitamins, and antioxidants to maintain good health.
Moore Power 12-8 (Thomas Moore Feed)
FatFat
Mineral BalanceMineral Balance
NutritionNutrition
ProteinProtein
Moore Power 12-8 by Thomas Moore Feed is a pelleted feed that contains 12% protein and 8% fat. It is intended to balance the diet, assist with body conditioning, and contains vitamins and minerals.
Moore Power 14-10 (Thomas Moore Feed)
EnergyEnergy
GrowthGrowth
NutrientsNutrients
PerformancePerformance
Moore Power 14-10 from Thomas Moore Feed is a high energy feed that is intended for breeding, growing, or performance horses. It contains protein, fat, fiber, vitamins and minerals.
Moulee HM 13% Liberte (Nature Belisle)
Complete FeedComplete Feed
GrainsGrains
NutritionNutrition
PerformancePerformance
Moulee HM 13% Liberte is a textured feed intended for performance horses and those in heavy work. It contains 13% protein, 6.09% fat, and 7.86% fibre.
Moulee Jument 16% Liberte (Nature Belisle)
BroodmareBroodmare
Complete FeedComplete Feed
NutritionNutrition
ProteinProtein
Moulee Jument 16% Liberte is a cubed feed intended for broodmares. It contains 16% protein, 4.85% fat, and 8.35% fibre.
Moulee Poulain Liberte 17% (Nature Belisle)
Complete FeedComplete Feed
FoalFoal
GrowthGrowth
NutritionNutrition
Moulee Poulain Liberte 17% by Nature Belisle is intended for horses and ponies aged 0-2 years of age. This cubed feed contains 17% protein as its primary energy source.
Moulee Q-F 15% Liberte (Belisle)
EnergyEnergy
FatFat
FiberFiber
NutritionNutrition
Moulee Q-F 15% is a complete feed with 15% crude protein and 7% crude fat. It also contains vitamin E and selenium. This feed is intended for all horses and ponies.
Moulée Quali-Fibre (Nature Belisle)
FiberFiber
Omega 3-6-9Omega 3-6-9
ProbioticProbiotic
VitaminsVitamins
Moulee Quali-fibre is a feed intended for horses with higher energy demands, such as performance horses. It contains 15% protein, 7% fat and 23% fibre with added vitamin E and selenium.
Move Free (Dunstan)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
Competition HorsesCompetition Horses
ExerciseExercise
Move Free by Dunstan is a textured feed formulated to support horses who are prone to "Tying-Up". It is intended for horses with high energy demands but are unable to tolerate high grain diets. It contains sugarbeet and soybean hulls to provide calories from low starch, high fibre sources.

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