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Amino Acids - Feed Ingredient

Amino acids are the fundamental components of proteins and play essential roles in muscle development, enzyme activity, immune function, and overall metabolism in horses. They are classified as essential or non-essential based on whether they must be obtained from the diet or can be synthesized by the horse’s body. Essential amino acids, such as lysine, methionine, and threonine, must be provided in sufficient amounts to support protein synthesis and physiological functions.

In equine nutrition, amino acids are included in feeds and supplements to improve protein quality and ensure balanced nutrient intake. Lysine is considered the first limiting amino acid in horse diets, meaning its deficiency can restrict protein utilization even if total protein intake appears adequate. Methionine, another essential amino acid, is critical for hoof integrity, muscle maintenance, and metabolic processes but is often limited in plant-based protein sources. Proper amino acid balance is particularly important for young, growing horses, performance horses, and those on forage-based diets with lower-quality protein sources.

The following equine feeds, supplements and products contain Amino Acids 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.
DL-Methionine (Mad Barn)
Amino AcidAmino Acid
Coat QualityCoat Quality
Competition HorsesCompetition Horses
IngredientIngredient
Methionine is an essential amino acid that is important for maintaining healthy tendons, ligaments, and hooves. Growing horses and horses who are in heavy exercise have a higher demand for methionine and would benefit from supplementation.
L-Lysine (Mad Barn)
Amino AcidAmino Acid
ImmunityImmunity
IngredientIngredient
JointsJoints
Lysine is an essential amino acid that is important for forming strong collagen bonds. Lysine is the most commonly deficient amino acid in equine diets.
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.
Three Amigos (Mad Barn)
Amino AcidAmino Acid
MuscleMuscle
ProteinProtein
RecoveryRecovery
Three Amigos is an equine essential amino acid supplement containing lysine, methionine, and threonine in a 5:3:2 ratio. These are the three most common limiting amino acids in the horse's diet.
Threonine (Mad Barn)
Amino AcidAmino Acid
Gut HealthGut Health
MuscleMuscle
ToplineTopline
Threonine is an essential amino acid that is required to be supplied in equine diets as it cannot be synthesized endogenously. Threonine supplementation may improve nutrient absorption.
Visceral+ (Mad Barn)
DigestionDigestion
Gut HealthGut Health
ImmunityImmunity
ProbioticProbiotic
UlcersUlcers
YeastYeast
Visceral+ by Mad Barn is a pelleted supplement to be used for horses with gastric health concerns. It is designed to maintain stomach and hindgut health and to support the immune system.
Tye-Cal Max (Basic Equine Nutrition)
HealthHealth
Mineral BalanceMineral Balance
MuscleMuscle
VitaminsVitamins
Tye-Cal Max from Basic Equine Nutrition is an additive that is meant to assist in the relaxation of muscles in horses and to help prevent tying-up. It is a powdered supplement containing calcium, vitamins, and other minerals.
U-Balance Foundation (Uckele)
FiberFiber
Mineral BalanceMineral Balance
ProteinProtein
VitaminsVitamins
Uckele U-Balance Foundation is a pelleted vitamin, mineral, and amino acid supplement for horses. It is intended to balance the diet without adding significant calories. This supplement can also supports sugar metabolism.
Ulc-R-Aid (AniMed)
Gut HealthGut Health
ImmunityImmunity
Mineral BalanceMineral Balance
UlcersUlcers
Ulc-R-Aid from AniMed is a powdered supplement that is supposed to support horses prone to gastric ulcers. It aids in immune function and contains Colostrashield.
ULS-Gard Pellets (Equine America)
DigestionDigestion
Gut HealthGut Health
NutrientsNutrients
ProbioticProbiotic
ULS-Gard Pellets from Equine America is a stomach and gastrointestinal tract supplement. It is meant to support normal pH, proper function and contains pro- and prebiotics.
Ulsus (Peak Performance Nutrients)
DigestionDigestion
Gut HealthGut Health
NutrientsNutrients
UlcersUlcers
Ulsus by Peak Performance Nutrients is a powdered gut supplement designed for horses with low hay intake, stall bound and fed processed feeds. It intends to support normal acid production and mucus production.
Ultimate (Doctor’s Choice Supplements)
Amino AcidAmino Acid
Metabolic SyndromeMetabolic Syndrome
Omega 3-6-9Omega 3-6-9
Ration BalancerRation Balancer
Ultimate by Doctor's Choice Supplements is a ration balancer intended for horses on pasture of forage. It contains high levels of calcium, thiamine and the first limiting amino acid lysine.
Ultimate (Greenline)
Mineral BalanceMineral Balance
NutritionNutrition
Ration BalancerRation Balancer
VitaminsVitamins
Greenline Ultimate is an equine vitamin, trace mineral, and amino acid supplement intended for everyday use. It provides Vitamin A, Vitamin D3, Pantothenic Acid, Folic Acid, Thiamine (B1), Vitamin B12, Choline, Cobalt, Vitamin E, Riboflavin (B2), Niacin, Pyridoxine, Biotin, and Iron.
Ultimate Balancer (Dodson & Horrell)
AntioxidantAntioxidant
Hoof HealthHoof Health
Ration BalancerRation Balancer
YeastYeast
Ultimate Balancer by Dodson & Horrell is a low-calorie ration balancer with the added benefits of hoof support and digestive support. This supplemental feed includes ingredients such as vitamin and mineral premix, yeast, and herbs added for antioxidants.
ULTIMATE FINISH 25 (BUCKEYE Nutrition)
FatFat
Omega 3-6-9Omega 3-6-9
Skin + HairSkin + Hair
Weight IssuesWeight Issues
Ultimate Finish 25 is a high-fat (25%) supplement intended for use as a top-dressing to add energy to the diet for working horses or horses that need to gain weight gain. It is formulated with soybeans, flaxseed, and rice bran.
Ultimate Recovery (Buckeye)
Amino AcidAmino Acid
Competition HorsesCompetition Horses
ExerciseExercise
RecoveryRecovery
Buckeye Ultimate Recovery is an extruded performance horse supplement containing added fats and branched-chain amino acids to support muscle and tissue recovery. This supplement also contains electrolytes to aid in rehydration.
Ultium Gastric Care (Purina)
Competition HorsesCompetition Horses
Gut HealthGut Health
StressStress
UlcersUlcers
Purina® Ultium® Gastric Care is a concentrate feed intended for performance horses to support gastric and hindgut health. It provides digestible fibres from beet pulp, alfalfa and soy hulls.
Ultium Growth Formula (Purina)
BroodmareBroodmare
Complete FeedComplete Feed
GrowthGrowth
LactationLactation
Purina Ultium® Growth Formula is a concentrate feed intended for breeding and growing horses. It provides 9.5% fat with added amino acids to support development.
Ultium® Competition Horse Formula (Purina Mills)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
Ultium Competition Horse Formula is a pelleted horse feed designed to support horses in competition. It is a high-fat, high-fibre ration that contains 12% protein.
Ultra Complete (Tribute)
EnergyEnergy
FatFat
PerformancePerformance
Weight IssuesWeight Issues
Ultra Complete is a high-fat and fibre textured feed formulated for adult horses in heavy work, such as racehorses in training. It is made with beet pulp, molasses, whole oats and soybeans.
Ultra Dynamix (Seminole)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
Organic Trace MineralsOrganic Trace Minerals
ProteinProtein
Seminole Ultra Dynamix™ is a high-calorie pelleted horse feed for growing, breeding and performance horses. It contains oats, corn, digestible fibers, soybean oil and stabilized rice bran.
Ultra GH (Tribute)
FatFat
Feed EfficiencyFeed Efficiency
FiberFiber
Gut HealthGut Health
Tribute Ultra GH is a complete pelleted feed intended to support gastrointestinal health in performance horses. It contains added microencapsulated dry yeast, direct-fed microbials, organic and inorganic trace minerals. It provides 8% crude fat and 21.5% NSC.
UltraCruz Equine Advanced Hoof Supplement (Santa Cruz Animal Health)
Amino AcidAmino Acid
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
UltraCruz Equine Advanced Hoof Supplement contains essential vitamins and minerals to support hoof growth in horses. It comes in a pelleted form with biotin, amino acids and other nutritional building blocks.
UltraCruz Equine Appetite Support (Santa Cruz Animal Health)
Gut HealthGut Health
ProbioticProbiotic
Weight IssuesWeight Issues
YeastYeast
UltraCruz Equine Appetite Support Supplement is a pelleted supplement intended to increase appetite and support digestive health. It provides 30 billion CFU of probiotics and prebiotics, as well as 2 grams of L-glutamine per serving (56 grams). It can be fed to stressed horses and weanlings.
UltraCruz Equine BCAA (Santa Cruz Animal Health)
Amino AcidAmino Acid
MuscleMuscle
NutrientsNutrients
ToplineTopline
UltraCruz Equine BCAA is a pelleted supplement that supplies the branched-chain amino acids leucine, isoleucine and valine, as well as glutamine. BCAAs are fed to horses to support muscle function and exercise performance.
UltraCruz Equine Calming Supplement (Paste) (Santa Cruz Animal Health)
Amino AcidAmino Acid
CalmingCalming
NutrientsNutrients
VitaminsVitamins
UltraCruz Equine Calming Supplement by Santa Cruz Animal Health is formulated to encourage relaxation in horses that are tense or anxious. The recommended dose is two syringes of paste per day. This supplement contains several B-vitamins, along with magnesium, calcium and the amino acid theanine.
UltraCruz Equine Calming Supplement (Pellets) (Santa Cruz Animal Health)
CalmingCalming
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
UltraCruz Equine Calming Supplement is intended to be fed to nervous or stressed horses, to encourage focus and relaxation. It contains calcium, magnesium, theanine (an amino acid), and several B-vitamins. The pelleted version also contains rice bran and flaxseed, and is intended to be fed at 120 grams per day.
UltraCruz Equine Lysine (Pellet) (Santa Cruz Animal Health)
Amino AcidAmino Acid
Hoof HealthHoof Health
MuscleMuscle
ToplineTopline
UltraCruz Equine Lysine is a pelleted supplement containing 5 grams of the amino acid lysine per serving. Lysine is the amino acid that is most commonly deficient in equine diets.
UltraCruz Equine Lysine (Powder) (Santa Cruz Animal Health)
Amino AcidAmino Acid
Hoof HealthHoof Health
MuscleMuscle
ToplineTopline
UltraCruz Equine Lysine is a powdered supplement that provides 5 grams of the amino acid lysine per serving. Lysine is the amino acid that is most commonly deficient in equine diets.
UltraCruz Equine Senior Joint Supplement (Santa Cruz Animal Health)
ExerciseExercise
JointsJoints
PerformancePerformance
SeniorSenior
UltraCruz Equine Senior Joint Supplement is a pelleted joint supplement containing glucosamine, MSM, chondroitin sulfate, and hyaluronic acid. This supplement can support the structural integrity of joints and connective tissue.
UltraCruz Equine Wellness Performance Supplement (Santa Cruz Animal Health)
HealthHealth
Mineral BalanceMineral Balance
Omega 3-6-9Omega 3-6-9
VitaminsVitamins
UltraCruz Equine Wellness Performance Supplement is formulated to supplement vitamins and minerals, antioxidants, and fatty acids to the horse’s diet. This includes zinc, copper, and Vitamin E. It supplies 2 mg of biotin per serving (136 g).
UltraCruz Foal Advanced Probiotic Paste (Santa Cruz Animal Health)
DigestionDigestion
FoalFoal
Gut HealthGut Health
ProbioticProbiotic
UltraCruz Foal Advanced Probiotic Paste is intended for use in newborn to weaned foals. It contains probiotics (Lactobacillus rhamnosus), yeast (Saccharomyces cerevisiae), L-glutamine, and digestive enzymes (lactase and amylase) blended in flaxseed oil.
ULZERless Pellets (Formula 707)
DigestionDigestion
Gut HealthGut Health
HealthHealth
UlcersUlcers
ULZERless Pellets from Formula 707 is a pelleted supplement intended to support stomach health and digestion. It is meant for horses prone to ulcers.
UN-LOCK Race Performance Powder (BRL Equine)
Amino AcidAmino Acid
ElectrolyteElectrolyte
ExerciseExercise
PerformancePerformance
UN-LOCK Equine Race Performance Powder is a muscle supplement containing branched-chain amino acids, vitamins, and electrolytes. It is a source of the amino acids L-valine, L-leucine, L-isoleucine, l-glutamine, L-arginine, and L-carnitine.
Unbeetable Balance (Unbeetable Feeds)
FiberFiber
Grain FreeGrain Free
Mineral BalanceMineral Balance
VitaminsVitamins
Unbeetable Balance is a ration balancer from Unbeetable Feeds. It is a grain-free, pelleted formulation intended for horses that require controlled calorie intake.
Unbeetable Complete (Unbeetable Feeds)
EnergyEnergy
Grain FreeGrain Free
Low NSC FeedsLow NSC Feeds
ProteinProtein
Unbeetable Complete by Unbeetable feeds is a grain free complete feed intended for all horse types. It contains a blend of organic and inorganic trace minerals.
Ungulate (St.Hippolyt)
Hoof HealthHoof Health
NutrientsNutrients
NutritionNutrition
Organic Trace MineralsOrganic Trace Minerals
Ungulate by St.Hippolyt is a pelleted supplement intended to support hoof health in horses.
Uveitis Formula (The Equine Edge)
AntioxidantAntioxidant
HealthHealth
ImmunityImmunity
VisionVision
Uveitis Formula from Total Horse Health is a powdered supplement intended for horses with uveitis. This supplement contains jalapeno, turmeric and echinacea which are intended to manage symptoms of uveitis in horses.
Veloci-T Max (Purina)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
Purina Veloci‑T Max is a textured feed intended for racehorses, breeding stallions, early gestating mares, and yearlings. . It is formulated with higher fat and starch levels to meet the high energy demands of performance horses.
Vermont Blend (Custom Equine Nutrition)
Amino AcidAmino Acid
DigestionDigestion
Mineral BalanceMineral Balance
YeastYeast
Vermont Blend by Custom Equine Nutrition is a supplement intended to balance out the deficiencies when a horse is solely fed grass hay. It contains amino acids, biotin and minerals such as copper and magnesium.
Vermont Blend No Selenium (Custom Equine Nutrition)
Amino AcidAmino Acid
Hoof HealthHoof Health
Mineral BalanceMineral Balance
YeastYeast
Vermont Blend No Selenium is a mineral and vitamin supplement containing no added selenium for horses with diets that already contain adequate amounts of this trace mineral.
Vermont Blend Pellets (Custom Equine Nutrition)
Amino AcidAmino Acid
Mineral BalanceMineral Balance
VitaminsVitamins
YeastYeast
Vermont Blend by Custom Equine Nutrition is a pelleted supplement intended to be fed to horses solely on grass hay. It contains amino acids, biotin and minerals such as copper and magnesium.
Vermont Blend Pro (Custom Equine Nutrition)
Gut HealthGut Health
Hoof HealthHoof Health
Organic Trace MineralsOrganic Trace Minerals
Ration BalancerRation Balancer
Vermont Blend Pro is a forage balancer and hoof supplement with added yeast cultures. It uses organic sources of copper and zinc. It has a lower feeding rate than the original Vermont Blend.
Vermont Blend Pro No Selenium (Custom Equine Nutrition)
Amino AcidAmino Acid
Gut HealthGut Health
Hoof HealthHoof Health
Ration BalancerRation Balancer
Vermont Blend Pro No Selenium by Custom Equine Nutrition is a supplement containing no added selenium intended for horses with diets that already contain adequate amounts of this trace mineral.
Via-Calm (AniMed)
CalmingCalming
Mineral BalanceMineral Balance
PerformancePerformance
StressStress
AniMed's Vita-Calm is a supplement that is meant to reduce stress and provides vitamins, minerals, and amino acids. It can help calm horses, especially before events which may cause nervousness.
Victoria Racer’s Edge (Thomas Moore Feed)
EnergyEnergy
FatFat
NutrientsNutrients
PerformancePerformance
Victoria Racer's Edge from Thomas Moore Feed is a performance feed that is high in energy and is meant to be fed alongside forage. It contains vitamins and minerals and is intended to support body condition.
Victory! (Seminole)
FatFat
Feed EfficiencyFeed Efficiency
PerformancePerformance
StaminaStamina
Seminole Victory!™ is a beet pulp-based textured feed containing oats, barley and stabilized rice bran. It contains 29% NSC and is targetted to mature performance horses.
Vintage Mare & Foal (Blue Seal) – [Discontinued]
Complete FeedComplete Feed
FoalFoal
GrowthGrowth
LactationLactation
Vintage Mare & Foal by Blue Seal is a now-discontinued feed which was a high-protein, high-energy extruded feed targeted to broodmares during pregnancy and lactation, as well as growing horses. It contained grains such as oats, corn, and barley, as well as soybean and alfalfa meal.
Vintage Sweet (Blue Seal) – [Discontinued]
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
NutritionNutrition
Weight IssuesWeight Issues
Vintage Sweet by Blue Seal is a now-discontinued feed with lower-protein, high-fat extruded feed formulated for working horses. It contained 12% crude protein and 8% fat, with energy supplied by cracked corn, oats, wheat, molasses, and oil.
Vintage Versatility (Blue Seal) – [Discontinued]
Caloric EnergyCaloric Energy
ExerciseExercise
GrowthGrowth
LactationLactation
Vintage Versatility by Blue Seal is a now-discontinued extruded feed designed for growth, performance and lactation. It contained 14% crude protein and 10% fat, with energy sources coming from oats, soybeans, oil, and corn.
Vita Plus (Farnam)
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Farnam Vita Plus is a pelleted vitamin and mineral supplement for horses. It is designed to provide organic and inorganic trace minerals.
VITAboost-Pellet (Herbs for Horses)
Blood CellsBlood Cells
MetabolismMetabolism
Mineral BalanceMineral Balance
VitaminsVitamins
Vitaboost is a multivitamin blend for horses containing 8 water soluble B-vitamins, Vitamin C, natural Vitamin E, microminerals, organic selenium, and amino acids.
VITAboost-Powder (Herbs for Horses)
Blood CellsBlood Cells
MetabolismMetabolism
Mineral BalanceMineral Balance
VitaminsVitamins
Vitaboost is a multivitamin blend for horses containing 8 water soluble B-vitamins, Vitamin C, natural Vitamin E, microminerals, organic selenium, and amino acids.
Vital Muesli (Dodson & Horrell)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
GrainsGrains
PerformancePerformance
Vital Muesli is a high starch feed designed for racehorses in full training. This feed includes the elevated protein and fat levels required to sustain the heavy workload and the vitamins and minerals necessary for proper nutrient absorption.
Vitamins & Minerals Alfalfa (Equine Challenge)
HealthHealth
Mineral BalanceMineral Balance
Ration BalancerRation Balancer
VitaminsVitamins
Vitamins and Minerals Alfalfa by Equine Challenge is a vitamin and mineral supplement intended for horses on Alfalfa based diets.
Vitamins & Minerals Grass (Equine Challenge)
Vitamins & Minerals Grass from Equine Challenge is an equine supplement formulated for horses on grass diets. Vitamins & Minerals Grass is intended to assist in healthy coat and hoof growth. This supplement is formulated with flaxseed, added vitamins, minerals, and probiotics.

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