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Selenium Yeast - Feed Ingredient

Selenium yeast is an organic form of selenium produced by fermenting yeast (Saccharomyces cerevisiae) in a selenium-enriched medium. During fermentation, the yeast incorporates selenium into amino acids which is the most bioavailable form of selenium for animals. Selenium yeast is commonly used in livestock and equine nutrition to support antioxidant function, immune health, and proper muscle function.

Compared to inorganic sources like sodium selenite, selenium yeast is more efficiently absorbed and retained in tissues, leading to improved selenium status in the body. Selenium yeast is also considered safer than selenium salts, as it has a lower risk of toxicity.

Selenium is an essential trace mineral required for the activity of glutathione peroxidase, an enzyme that protects cells from oxidative damage. Horses and other animals depend on dietary selenium because they cannot synthesize it internally.

In horses, selenium deficiency can lead to muscle weakness, poor immune response, and white muscle disease in foals. However, excessive selenium intake can be toxic, causing symptoms such as hoof cracking, hair loss, and neurological issues.

The following equine feeds, supplements and products contain Selenium Yeast 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.
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 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 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 (Triple Crown)
Complete FeedComplete Feed
FatFat
Grain FreeGrain Free
SeniorSenior
Triple Crown Senior is a grain-free, beet pulp-based, high-fat feed designed to meet the needs of older horses. It provides 17% fiber and can be fed as the sole ration for horses unable to eat forage due to dental issues.
Senior Active + (Triple Crown)
HealthHealth
NutritionNutrition
SeniorSenior
Weight IssuesWeight Issues
Senior Active + from Triple Crown is an extruded pelleted intended for older horses or hard keepers. This feed is intended for horses with metabolic issues.
Senior Balancer (Buckeye)
JointsJoints
Mineral BalanceMineral Balance
SeniorSenior
VitaminsVitamins
Buckeye SENIOR BALANCER is a pelleted ration balancer for mature horses. It provides vitamins, minerals and amino acids and contains the joint supplement MSM.
Senior Care (Banks Mill Feeds)
FiberFiber
Mineral BalanceMineral Balance
SeniorSenior
VitaminsVitamins
Banks Mill Feeds Senior Care is an easy-to-chew pelleted feed intended for senior horses with dental issues. It is meant to be made into a mash and provides high fiber content to replace forage.
Senior Feed (DuMOR)
Complete FeedComplete Feed
DentalDental
NutritionNutrition
SeniorSenior
Senior Feed by DuMOR is an easy-to-chew formulation for older horses. It contains added biotin to support hooves, 14% crude protein, 4% crude fat, and 19.5% crude fibre.
Senior Formula (Seminole)
AntioxidantAntioxidant
Complete FeedComplete Feed
Gut HealthGut Health
SeniorSenior
Seminole Senior Formula™ is a textured feed formulated to meet the needs of senior horses. This easy-to-chew feed is beet pulp-based and contains rice bran, molasses and soybean oil for energy.
Senior GC Pelleted Feed (BUCKEYE Nutrition)-[Discontinued]
Complete FeedComplete Feed
HealthHealth
JointsJoints
SeniorSenior
Senior GC is a now-discontinued pelleted feed from Buckeye Nutrition targeted to older horses with functional teeth. Senior GC provided glucosamine, chondroitin, and MSM to support joint health.
Senior Gold (Triple Crown)
DentalDental
DigestionDigestion
FatFat
SeniorSenior
Triple Crown Senior Gold is a grain-free, beet pulp-based soft feed intended for older horses. It contains 14.5% protein, 12.5% fat and 9% NSC. Senior Gold can be mixed with water to form a mash for horses with dental issues or prone to choke.
Senior Health & Wellness (Farnam)
Gut HealthGut Health
Mineral BalanceMineral Balance
SeniorSenior
VitaminsVitamins
Farnam's Senior Health & Wellness supplement is formulated for senior horses in light work or at maintenance. Senior Health and Wellness is an extruded nugget feed containing amino acids, vitamins, and minerals for horses on a forage-only diet.
Senior HF (Excel Equine Feeds)
DigestionDigestion
HealthHealth
SeniorSenior
Weight IssuesWeight Issues
Senior HF by Excel Equine Feeds is a textured feed intended to be palatable for senior horses with weight issues or needing digestive support.
Senior Horse (Sprout)
Amino AcidAmino Acid
NutrientsNutrients
SeniorSenior
VitaminsVitamins
Senior Horse by Sprout is a pelleted maintenance feed specially formulated for senior horses. It contains added lysine and biotin.
Senior Needs (Excel Equine Feeds)
DigestionDigestion
ImmunityImmunity
SeniorSenior
VitaminsVitamins
Senior Needs from Excel Equine Feeds is a textured feed meant for seniors to help support digestion, immunity, and skeletal strength. It is readily digestible and contains minerals and vitamins.
Senior Pellet (Masterfeeds)
Complete FeedComplete Feed
DigestionDigestion
FiberFiber
SeniorSenior
Masterfeeds Senior is a complete pelleted horse feed formulated with high-calorie digestible fiber sources and added fat. It is designed to meet the needs of senior horses and horses requiring a low-starch diet and low glycemic ration.
Senior Pellet (Right Choice)
FatFat
FiberFiber
NutritionNutrition
SeniorSenior
Senior by Right Choice is a pelleted complete feed intended for senior horses with elevated protein. It contains 14% protein, 7% fat, and 19% NSC.
Senior Pelleted (Woody’s Horse Nutrition)
DigestionDigestion
FiberFiber
Gut HealthGut Health
SeniorSenior
Woody's Senior Pelleted is a complete pelleted grain-free feed intended for senior horses. It contains digestible fibre sources for horses that can no longer chew long-stem hay.
Senior Sport (Tribute)
Complete FeedComplete Feed
ExerciseExercise
FiberFiber
SeniorSenior
Tribute Senior Sport™ is a high calorie feed for mature performance horses. It provides 16.5% NSC with 10% fat and 18% fibre to support performance.
Senior Sport with Glucosamine (Tribute)
ExerciseExercise
FatFat
FiberFiber
SeniorSenior
Senior Sport with Glucosamine by Tribute is a textured feed for seniors with added glucosamine that intends to support joint health. It contains high fat and fibre to support calmer performances.
Senior Stable Mix (Elk Grove Milling)
Complete FeedComplete Feed
HealthHealth
NutritionNutrition
SeniorSenior
Elk Grove Milling's Senior Stable Mix is a pelleted formula intended for mature and senior horses. It is high in fibre and it can be used as a forage replacement for horses with dental or digestion issues.
Senior Stable Mix GC (Elk Grove Milling)
Complete FeedComplete Feed
JointsJoints
NutrientsNutrients
SeniorSenior
Senior Stable Mix GC by Elk Grove Milling is a complete feed containing glucosamine and chondroitin. It is intended for senior horses showing signs of arthritis.
Senior Textured (Woody’s Horse Nutrition)
Caloric EnergyCaloric Energy
FatFat
ProteinProtein
SeniorSenior
Woody’s Senior Textured is a complete textured feed formulated for senior horses. It contains 10% fat and is made with oats, beet pulp, molasses, and vegetable oil. The crude protein in this feed has added amino acids to help maintain muscle mass.
Senior Textured Feed (ProElite)
DigestionDigestion
Feed EfficiencyFeed Efficiency
PerformancePerformance
SeniorSenior
Pro Elite Senior Textured Feed is a high fat (10%) and protein (14%) senior complete feed. It is appropriate for senior horses that need help maintaining or gaining weight.
Seniority GC Plus (Tribute Equine)
Complete FeedComplete Feed
JointsJoints
RespiratoryRespiratory
SeniorSenior
Tribute Seniority™ GC Plus is a textured, complete feed for mature horses that contains additional ingredients to support joint health. It is formulated with glucosamine, chondroitin sulfate, and MSM.

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