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Thiamine (Vitamin B1) - Feed Ingredient

Thiamine, also known as Vitamin B1, is a water-soluble vitamin essential for carbohydrate metabolism, nervous system function, and energy production in horses. It plays a critical role in the conversion of glucose into ATP, the primary energy source for cells, by acting as a coenzyme in the Krebs cycle. Thiamine is also necessary for the proper functioning of the nervous system, as it helps regulate neurotransmitter activity and nerve impulse transmission.

Horses naturally produce some thiamine through microbial fermentation in the hindgut, and additional dietary sources include cereal grains, wheat bran, and brewer’s yeast. Deficiency is rare but can occur due to prolonged antibiotic use, excessive grain consumption, or ingestion of plants containing thiaminase enzymes (such as bracken fern and horsetail), which degrade thiamine. Symptoms of deficiency may include weight loss, muscle tremors, incoordination, and nervous system disturbances. In such cases, thiamine supplementation in the form of thiamine hydrochloride or thiamine mononitrate may be beneficial. As a water-soluble vitamin, excess thiamine is excreted in urine, making toxicity unlikely, though balanced supplementation is advised for optimal health.

The following equine feeds, supplements and products contain Thiamine (Vitamin B1) 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.
B-Vitamin Pak (Mad Barn)
CalmingCalming
ExerciseExercise
StressStress
VitaminsVitamins
B-Vitamin Pak is a comprehensive B-vitamin supplement in powder form. It provides a balanced profile of the B-Complex vitamins and may be beneficial for horses during times of heavy work, stress, or illness.
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.
Recovery Plus (Woody’s Horse Nutrition)
ExerciseExercise
MuscleMuscle
PerformancePerformance
RecoveryRecovery
Woody’s Recovery Plus is an equine supplement intended to be fed to horses post-exercise. It provides amino acids from whey protein concentrate, yeast, Vitamin E and other vitamins and minerals.
Recuperate (Hygain)
ElectrolyteElectrolyte
ExerciseExercise
HydrationHydration
VitaminsVitamins
Recuperate from Hygain is a supplement for horses that is intended to provide B vitamins and electrolytes. It is meant to help with exercise, muscle function, and hydration.
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 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.
Red Cell (Iron Rich Supplement)
Blood CellsBlood Cells
CirculationCirculation
Mineral BalanceMineral Balance
NutrientsNutrients
Red Cell® is a liquid vitamin-iron-mineral supplement for horses that are iron deficient. Each serving provides 300 mg of chelated iron. It includes B-complex vitamins to help support immune health.
Red Power (Golden Horseshoe)
Blood CellsBlood Cells
Mineral BalanceMineral Balance
PerformancePerformance
VitaminsVitamins
Red Power from Golden Horseshoe is a liquid supplement that is iron rich. It also contains vitamins and minerals that is meant to meet requirements of horses. Iron can help with blood health involving oxygen delivery and nutrient uptake.
Redglo (Farnam)
EnergyEnergy
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Farnam Redglo is a liquid vitamin and mineral supplement for horses. It is marketed as an iron-rich multivitamin supplement.
Refit (Excel Equine Feeds)
DigestionDigestion
MuscleMuscle
PerformancePerformance
RecoveryRecovery
Refit by Excel Equine Feeds is a pelleted supplement intended to support digestive health, muscle recovery, energy metabolism and immunity in performance horses.
ReitHoof Advanced Hoof Support (HorseTech)
Amino AcidAmino Acid
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
ReitHoof Advanced Hoof Support from HorseTech is a pelleted hoof supplement that has an alfalfa meal base. It contains minerals, vitamins, and amino acids.
Rejuvenaide Max Liquid (ProElite)
GrowthGrowth
HealthHealth
JointsJoints
MuscleMuscle
Rejuvenaide Max Liquid by Pro Elite is a liquid supplement formulated to support optimal joint and muscle development in growing horses.
Rejuvenaide Max Pellets (ProElite)
Bone HealthBone Health
FoalFoal
GrowthGrowth
JointsJoints
Rejuvenaide Max by ProElite is a pelleted supplement intended to support the joint and tendon development in foals and growing horses.
Relaxmor (DuMor)
CalmingCalming
HealthHealth
NutrientsNutrients
PerformancePerformance
Relaxmor by DuMor aids in a horse's nervous system function. Relaxmor contains Magnesium, Thiamine and Tryptophan which aid in calming a nervous horse.
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.
Rescue Aid (DAC)
DigestionDigestion
Gut HealthGut Health
HealthHealth
ProbioticProbiotic
Rescue Aid by DAC is a powdered supplement designed to support gut health and immune function in horses. It is formulated with probiotics to help maintain a healthy digestive system.
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.
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.
Round-Up (Manna Pro) [Discontinued]
FiberFiber
Hay StretcherHay Stretcher
NutritionNutrition
ProteinProtein
Round-Up by Manna Pro is an alfalfa-based horse feed that contains 12% protein and 2% fat. It contains vitamins as well as organic and inorganic minerals.
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 Senior Extruded Feed (Buckeye)
DentalDental
NutrientsNutrients
NutritionNutrition
SeniorSenior
Safe 'N Easy Senior is an extruded feed in an easy-to-chew format for older horses and ponies with dental issues. This feed also contains prebiotics and probiotics to support gut health. This feed contains 14.5% NSC.
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 Performance Controlled Starch Formula (Manna Pro)
Complete FeedComplete Feed
FatFat
NutritionNutrition
PerformancePerformance
Safe Performance Controlled Starch Formula from Manna Pro is a complete feed designed for horses at all life stages. It contains 14% crude protein and 17% NSC. Safe Performance Controlled Starch Formula contains Max-E Glo® Stabilized Rice Bran as a source of fat and energy.
Safe Performance Elite High Fat (Manna Pro)
Complete FeedComplete Feed
FatFat
NutritionNutrition
PerformancePerformance
Safe Performance Elite High Fat from Manna Pro is a beet pulp-based complete feed designed for horses at all life stages. It contains 12% crude protein and 18% NSCs. Safe Performance Elite High Fat contains Max-E Glo® Stabilized Rice Bran as a source of fat and energy. This feed contains no added corn or molasses.
Safe Performance Senior (Manna Pro)
Complete FeedComplete Feed
FiberFiber
NutritionNutrition
SeniorSenior
Safe Performance Senior from Manna Pro is a pelleted feed designed for senior horses in work. It is formulated with Max-E Glo® stabilized rice bran and beet pulp. It is a corn- and molasses-free formulation that contains 14% crude protein, 7% crude fat, and 19% NSC.
Safe Performance Special Diet (Manna Pro)
Complete FeedComplete Feed
FiberFiber
HealthHealth
Metabolic SyndromeMetabolic Syndrome
Safe Performance Special Diet from Manna Pro is a pelleted feed for adult horses. It uses Max-E Glo® stabilized rice bran as a source of fat and fiber. It contains 14% crude protein, 3% crude fat, and 17% NSC. This product uses a mix of organic and inorganic trace minerals.
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.
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.
Select 12-6 Pelleted Feed (Manna Pro) [Discontinued]
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
HealthHealth
NutritionNutrition
Select 12-6 Pelleted Feed from Manna Pro is formulated for mature horses. It contains 12% crude protein, 6% crude fat, 20% crude fibre, and uses a mix of organic and inorganic trace 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.
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 (Running Horse Elite Equine Nutrition)
DigestionDigestion
Feed EfficiencyFeed Efficiency
SeniorSenior
Weight IssuesWeight Issues
Running Horse Nutrition Senior is a highly digestible feed providing 14% protein, vegetable fat, and micro-nutrients. This feed targets older horses to help them maintain their body condition.
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.
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.

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