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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.
Rancher’s Sweet – Texture (Trouw)
Gut HealthGut Health
HealthHealth
NutrientsNutrients
NutritionNutrition
Rancher's Sweet Texture by Trouw is a sweet feed intended for horses in light to medium work.
Ration Balancer (Woody’s Horse Nutrition)
DigestionDigestion
Grain FreeGrain Free
ProteinProtein
Ration BalancerRation Balancer
Woody’s Feed Ration Balancer is a concentrated, pelleted feed intended to balance a forage-based diet. It provides chelated trace minerals and added probiotics. This feed is intended for all horses and ponies at any level of work.
Ration Balancer Original (Lifeline)
DigestionDigestion
Grain FreeGrain Free
HealthHealth
Ration BalancerRation Balancer
Ration Balancer Original by Lifeline is a grain-free pelleted supplement intended for horses who are sensitive to carbohydrates.
ReBuild (Pryde’s EasiFeed)
MuscleMuscle
Omega 3-6-9Omega 3-6-9
Skin + HairSkin + Hair
ToplineTopline
ReBuild by Pryde's EasiFeed is a pelleted supplement intended to help build topline and condition in all horse types.
Red Cal (Natural Horse Vet)
CalmingCalming
ElectrolyteElectrolyte
Mineral BalanceMineral Balance
NutrientsNutrients
Red Cal by Natural Horse Vet is a granular supplement that is intended for all life stages of horses and other livestock that provides salt, minerals, and electrolytes.
Red Cal GROW (Natural Horse Vet)
ElectrolyteElectrolyte
HydrationHydration
Mineral BalanceMineral Balance
NutrientsNutrients
Red Cal GROW by Natural Horse Vet is a granular supplement with added biotin, lysine, and methionine. It is intended for all life stages of horses and other livestock. It provides salt, minerals, and electrolytes.
Red Cal HERBAL (Natural Horse Vet)
ElectrolyteElectrolyte
HerbHerb
Mineral BalanceMineral Balance
VitaminsVitamins
Red Cal HERBAL by Natural Horse Vet is a granular supplement with added natural flavours that is intended for all life stages of horses and other livestock that provides salt, minerals, and electrolytes.
Red Cal Hi-MAG (Natural Horse Vet)
ElectrolyteElectrolyte
Metabolic SyndromeMetabolic Syndrome
Mineral BalanceMineral Balance
NutrientsNutrients
Red Cal Hi-MAG by Natural Horse Vet is a granular supplement with added magnesium oxide that is intended for all life stages of horses and other livestock. It provides salt, minerals, and electrolytes.
Release (Hygain)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
HealthHealth
Weight IssuesWeight Issues
Release by Hygain is a high-energy textured feed intended for performance horses. Release contains chelated minerals and natural vitamin E intended to support hard keepers.
Reliance® Pelleted Horse Feed (Southern States)
Complete FeedComplete Feed
ExerciseExercise
HealthHealth
NutritionNutrition
Reliance® Pelleted Horse Feed is formulated for adult horses at maintenance or in light work. It provides 3.5% fat, 15% fiber, and 11% protein with energy sources including wheat middlings, corn meal, soybean hulls and cane molasses.
Resolve (Tribute)
EnergyEnergy
ImmunityImmunity
MuscleMuscle
PerformancePerformance
Resolve is a pelleted complete feed from Tribute that is formulated to provide high-fat and high-fibre content with an NSC of 17.5%. It provides added Vitamin E which can support antioxidant status.
Respond High Grain Formula (Nutrena)
Competition HorsesCompetition Horses
EnergyEnergy
GrainsGrains
Weight IssuesWeight Issues
Respond High Grain Formula is a sweet feed style complete feed formulated for the high energy requirements of racehorses. It provides 12% protein and 6% fat with low levels of fibre.
Revive Senior (Bluegrass Horse Feed)
Complete FeedComplete Feed
JointsJoints
SeniorSenior
Weight IssuesWeight Issues
Revive Senior from Bluegrass Horse Feed is a feed that is meant to be highly digestible, support condition and joint health in senior horses. This feed can encourage weight gain and can be fed to horses with missing or worn teeth.
RG 14 (Hallway)
EnergyEnergy
FiberFiber
Gut HealthGut Health
ProteinProtein
RG 14 is a textured feed from Hallway, fortified with Stamm 30. This feed provides energy from digestible fibres and vegetable oil. RG 14 contains 14% protein, 6% fat, and 14% fibre.
RX Roughage – Pellet/Cube (Masterfeeds)
DentalDental
FiberFiber
Hay StretcherHay Stretcher
SeniorSenior
Masterfeeds Rx Roughage is a high fibre horse feed that comes in the form of pellets or cubes. It is used to add bulk to the diet as a hay stretcher or can be soaked for horses with dental issues such as seniors.
Safe ‘N Easy Complete (Buckeye)
Complete FeedComplete Feed
DentalDental
GrainsGrains
NutritionNutrition
Buckeye SAFE 'N EASY™ Complete Pelleted Feed is a feed intended for horses or ponies with dental issues or horses with limited forage in their diet. It is meant to provide an easy-to-chew fiber blend with no corn or molasses.
SAFE ‘N EASY Pelleted Feed (BUCKEYE Nutrition)
Complete FeedComplete Feed
Easy KeeperEasy Keeper
FiberFiber
HindgutHindgut
Buckeye Safe 'N Easy™ Pelleted Feed is a 12.5% NSC horse feed intended for starch-sensitive horses and ponies or those that require a lower calorie diet. It is formulated with no corn or molasses.
SAFE ‘N EASY Performance (BUCKEYE Nutrition)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
Mineral BalanceMineral Balance
PerformancePerformance
Buckeye SAFE 'N EASY™ Performance is a pelleted horse feed that provides high energy density from fat and fibre. It has a 13.5% NSC and is corn- and molasses-free.
SAFE ‘N EASY Textured Feed (Buckeye)
Complete FeedComplete Feed
DentalDental
Gut HealthGut Health
NutrientsNutrients
Buckeye SAFE 'N EASY Textured Feed is a 16.5% NSC feed made without corn or molasses. This feed provides moderate energy density and is intended for horses requiring a low calorie diet.
Safe Starch Forage (Triple Crown)
ForageForage
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
Ration BalancerRation Balancer
Triple Crown Safe Starch® Forage is a forage-based feed containing a mixture of orchard and timothy hays fortified with vitamins, minerals and direct-fed microbials.
SafeChoice All Life Stages (Nutrena)
Gut HealthGut Health
ImmunityImmunity
Organic Trace MineralsOrganic Trace Minerals
ToplineTopline
SafeChoice All Life Stages is a pelleted feed that is meant to support skin and coat health, hoof health, and topline support. It is also supposed to assist with gut health and immunity, and contains organic trace minerals.
SafeChoice Maintenance (Nutrena)
Complete FeedComplete Feed
DigestionDigestion
FiberFiber
NutritionNutrition
Nutrena SafeChoice Maintenance is a pelleted horse feed that provides a maximum of 25% NSC (20% starch and 5% sugar). It is intended as a low-starch feed to maintain body condition.
SafeChoice Mare & Foal Pellet (Nutrena)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
SafeChoice Mare & Foal Pellet is a horse feed intended for pregnant or lactating mares, weanlings, and yearlings. It contains a maximum of 22% NSC with higher protein meant to meet the needs of growing horses.
SafeChoice Mare & Foal Textured (Nutrena)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Nutrena SafeChoice Mare & Foal Textured is a texturized feed intended for pregnant or lactating mares, weanlings, and yearlings. It contains a maximum of 30% NSC and 16% protein meant to meet the needs of growing horses.
SafeChoice Original (Nutrena) – [DISCONTINUED]
Complete FeedComplete Feed
Gut HealthGut Health
HealthHealth
Ration BalancerRation Balancer
Nutrena SafeChoice Original is a pelleted horse feed intended to meet the nutritional needs of a wide range of horses. It provides 22% NSC with 14% protein and 7% fat. SafeChoice Original is now SafeChoice All Stages.
SafeChoice Perform Pellet (Nutrena)
Competition HorsesCompetition Horses
EnergyEnergy
ExerciseExercise
NutritionNutrition
SafeChoice Perform is a pelleted feed intended to meet the needs of hard keepers and performance horses. It contains 14% crude protein, 9% crude fat, and 24% NSC.
SafeChoice Perform Textured (Nutrena)
Competition HorsesCompetition Horses
EnergyEnergy
ExerciseExercise
NutritionNutrition
Nutrena SafeChoice Perform Textured is a high-fat high-calorie feed. It is intended for horses with higher energy requirements, including performance horses and hard keepers.
SafeChoice Senior (Nutrena)
Coat QualityCoat Quality
DentalDental
SeniorSenior
Weight IssuesWeight Issues
SafeChoice Senior is an easy-to-chew, high-fat, controlled starch feed intended for older horses. It is meant to support horses experiencing age-related weight loss, fatigue, or horses with muscle or coat quality issues.
SafeChoice Senior LM (Nutrena)
Coat QualityCoat Quality
DentalDental
SeniorSenior
Weight IssuesWeight Issues
SafeChoice Senior LM is a lower-molasses (LM) high-starch feed intended for senior horses, particularly horses that need to gain weight or have dental issues. It contains 14% crude protein, 8% crude fat, and 18.5% NSC.
SafeChoice Special Care (Nutrena)
Complete FeedComplete Feed
Easy KeeperEasy Keeper
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
SafeChoice Special Care by Nutrena is a controlled starch formula intended for horses with metabolic concerns and easy keepers. It is a corn-free feed that contains a maximum of 7% dietary starch and 3% sugar.
Seasons Biome Blend – Spring (Stable Feed)
FiberFiber
Grain FreeGrain Free
NutrientsNutrients
VitaminsVitamins
Seasons Feed by Stable Feed is a textured feed that contains low starch, low sugar, high omega 3's, and high fibre. It contains ingredients such as sainfoin roughage, soybean meal, and chia seeds.
Security (Doctor’s Choice Supplements)
JointsJoints
PerformancePerformance
Ration BalancerRation Balancer
SeniorSenior
Security by Doctor's Choice Supplement is an organic ration balancer intended for mature and performance horses. It contains glucosamine, chondroitin, and yucca to support joint health.
Sel-Plex 1000 (Alltech)
AntioxidantAntioxidant
ImmunityImmunity
IngredientIngredient
MetabolismMetabolism
Sel-Plex® 1000 from Alltech is a proprietary organic selenium supplement in the form of selenized yeast. It is safer and more bioavailable compared to inorganic forms of selenite.
Sel-Plex 2000 (Alltech)
HealthHealth
MetabolismMetabolism
Mineral BalanceMineral Balance
YeastYeast
Sel-plex is a proprietary form of selenized yeast used to provide organic selenium. Selenium is an important antioxidant that supports metabolic function. Supplemental selenium is required in the horse's diet, particularly in areas where soil levels are low.
Sel-Plex 3000 (AllTech)
HealthHealth
ImmunityImmunity
Organic Trace MineralsOrganic Trace Minerals
YeastYeast
Sel-Plex® 3000 by Alltech is a proprietary form of the organic trace mineral selenium from selenized yeast. Selenium is involved in antioxidant processes and supports muscle health in horses.
Sel-Plex 600 (AllTech)
HealthHealth
ImmunityImmunity
Organic Trace MineralsOrganic Trace Minerals
YeastYeast
Sel-Plex 600 is a single-ingredient organic selenium yeast supplement that is used in horse feeds and products. Organic trace minerals are generally better absorbed than inorganic minerals.
Select Alfalfa (Select The Best)
Amino AcidAmino Acid
Mineral BalanceMineral Balance
VitaminsVitamins
YeastYeast
Select Alfalfa by Select The Best is a pelleted supplement ration balancer that intends to provide the vitamins, minerals, amino acids, and digestive support to balance diets mainly comprised of alfalfa hay.
Select Grass (Select The Best)
DigestionDigestion
Mineral BalanceMineral Balance
VitaminsVitamins
YeastYeast
Select Grass by Select The Best is a pelleted ration balancer that intends to provide the vitamins, minerals, amino acids, and digestive support to balance diets mainly comprised of grass.
Select One Vitamin/Mineral Balancer Pellet (Jones Horse Feeds)
Easy KeeperEasy Keeper
Low NSC FeedsLow NSC Feeds
Ration BalancerRation Balancer
VitaminsVitamins
Jones Select One Balancer Pellets is a concentrated mineral, vitamin and protein supplement. It is intended for overweight horses or easy keepers.
Selenium Supplement (HorseTech)
HealthHealth
NutrientsNutrients
NutritionNutrition
Organic Trace MineralsOrganic Trace Minerals
Selenium Supplement by HorseTech is a selenium yeast supplement that provides 1 mg of selenium per 10 g serving. It is intended to support horses whose diets may be lacking adequate selenium.
Selenium with Vitamin E (Herbs for Horses)
AntioxidantAntioxidant
Organic Trace MineralsOrganic Trace Minerals
RecoveryRecovery
VitaminsVitamins
Herbs for Horses Selenium with Vitamin E supplement combines natural vitamin E with organic selenium-enriched yeast. These antioxidant nutrients work together to support a healthy immune system and exercise recovery.
Selenium Yeast (Platinum Performance)
AntioxidantAntioxidant
MetabolismMetabolism
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
Platinum's Selenium Yeast is a powdered horse supplement providing 2,000 mcg of selenium in every 1 gram scoop. Selenized yeast is an organic form of the trace mineral selenium.
Selenium Yeast 2000 (TransChem)
HealthHealth
ImmunityImmunity
Organic Trace MineralsOrganic Trace Minerals
YeastYeast
TransChem Selenium Yeast 2000 PPM is made from Saccharomyces cerevisiae yeast grown in a selenium-rich medium. This supplement provides selenium in the form of selenomethionine.
Selenium Yeast 600
HealthHealth
ImmunityImmunity
Organic Trace MineralsOrganic Trace Minerals
YeastYeast
Selenium Yeast 600 is an organic selenized yeast supplement providing 600 ppm (mcg/gram) of selenium. It is made from Saccharomyces cerevisiae yeast grown in a selenium-rich medium and supplies this mineral in the form of an amino acid complex.
Selenium Yeast Blend (Uckele)
Selenium Yeast Blend from Uckele is made from organic chelated selenium yeast blend and brewer's yeast. Selenium Yeast Blend is intended for horses who require additional selenium without adding vitamin E.
SelenoSource AF 2000 (Diamond V)
AntioxidantAntioxidant
ImmunityImmunity
IngredientIngredient
MetabolismMetabolism
SelenoSource™ AF 2000 is an organic selenium supplement consisting of selenized Saccharomyces cerevisiae yeast. The primary active ingredient is selenomethionine.
Senior (Brooks Feeds)
Complete FeedComplete Feed
FiberFiber
Omega 3-6-9Omega 3-6-9
SeniorSenior
Brooks Senior is a complete textured feed for geriatric horses. It contains elevated levels of fat and protein, digestible fibre sources, and can be soaked for senior horses with dental issues.
Senior (Equine Advantage)
FatFat
FiberFiber
GrainsGrains
SeniorSenior
Senior by Equine Advantage is a textured feed intended to provide mature horses with essential nutrients. Ingredients such as shredded beet pulp & soybean hulls increase digestibility.
Senior (Hygain)
HealthHealth
ImmunityImmunity
NutritionNutrition
SeniorSenior
Senior from Hygain is a textured feed intended for senior horses. Senior contains added glucosamine intended to support joint health. This feed also contains added amino acids intended to support muscle development.
Senior (Sollio Agriculture)
HealthHealth
ImmunityImmunity
NutritionNutrition
SeniorSenior
Senior from Sollio Agriculture is a complete pelleted feed intended for senior horses. This feed is intended to provide energy and essential amino acids for aging horses.

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