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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.
Simplici-T Concept (Purina)
BroodmareBroodmare
Complete FeedComplete Feed
ExerciseExercise
StallionStallion
Simplici-T Concept is a pelleted, high fiber feed formulated for active pleasure horses. It provides low fat (2%) and moderate protein (12%), with ingredients such as soy hulls, ground corn and wheat shorts.
Simplici-T Pro Grain (Purina)
BroodmareBroodmare
Complete FeedComplete Feed
ExerciseExercise
StallionStallion
Simplici‑T Pro Grain is a textured feed for active adult horses and breeding horses. It is intended for use at boarding and recreational stables to support the needs of pleasure horses.
Sixteen Plus Mix (Dodson & Horrell)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
MuscleMuscle
SeniorSenior
Sixteen Plus Mix by Dodson & Horrell is a textured senior horse feed with higher protein levels and added vitamins and minerals for joint health and optimal absorption. This feed is also highly palatable with molasses, ricebran, and rapeseed oil ingredients.
Sleek (Banks Mill Feeds)
FatFat
FiberFiber
MuscleMuscle
PerformancePerformance
Sleek by Banks Feed Mill is a high-fat, beet pulp-based feed with low (7%) starch content. It contains 13% fat from flax, rice bran, and soybean oil.
Smart & Simple DMG (SmartPak)
MuscleMuscle
NutrientsNutrients
PerformancePerformance
RecoveryRecovery
Smart & Simple DMG from SmartPak is a granular supplement of Dimethylglycine (DMG) for horses. Smart & Simple DMG is intended to support normal muscle function and recovery.
Smartamine L (Adisseo)
Amino AcidAmino Acid
GrowthGrowth
ImmunityImmunity
ToplineTopline
Smartamine L is a source of the amino acid lysine. Lysine is often considered the first limiting amino acid in equine diets. Supplementation may be beneficial for horses experiencing muscle loss or poor topline.
Smartamine M (Adisseo)
Amino AcidAmino Acid
GrowthGrowth
Hoof HealthHoof Health
IngredientIngredient
Smartamine M is a source of the amino acid methionine. Methionine is often considered the second or third limiting amino acid in equine diets.
Smartamine ML (Adisseo)
Amino AcidAmino Acid
GrowthGrowth
IngredientIngredient
ProteinProtein
Smartamine ML is a source of the amino acids methionine and lysine. Methionine and lysine are two of the limiting amino acid in equine diets. Supplementation may support topline and muscle growth.
Smartbreathe Pellets (SmartPak)
HealthHealth
HerbHerb
NutrientsNutrients
RespiratoryRespiratory
SmartBreathe pellets are an equine supplement intended for horses with respiratory issues. It contains herbal ingredients, MSM, vitamin C, N-acetyl cysteine, and enzymes to support the respiratory system and a natural response to inflammation.
SmartBreathe Ultra Pellets (SmartPak)
ImmunityImmunity
IngredientIngredient
PerformancePerformance
RespiratoryRespiratory
SmartBreathe Ultra Pellets from SmartPak is a pelleted respiratory supplement for horses. SmartBreathe Ultra is formulated with spirulina, MSM, and grape seed extract intended to help horses with respiratory issues.
SmartBug-Off (SmartPak)
HerbHerb
ImmunityImmunity
NutrientsNutrients
Skin + HairSkin + Hair
SmartBug-Off is a pelleted horse supplement to deter biting insects and support skin health. It contains MSM, DL-methionine, garlic, apple cider vinegar, grape seed extract and other ingredients.
SmartBug-Off Pellets (SmartPak)
HealthHealth
HerbHerb
ImmunityImmunity
Skin + HairSkin + Hair
SmartPak's SmartBug-Off Pellets is a horse supplement that contains ingredients like garlic purported to deter biting insects. It also provides ingredients that support skin health.
SmartBug-Off Ultra Pellets (Smart Pak)
Coat QualityCoat Quality
HealthHealth
ImmunityImmunity
NutritionNutrition
SmartBug-Off Ultra Pellets from SmartPak is a pelleted supplement intended for horses who are bothered by flies. SmartBug-Off Ultra Pellets contain garlic and apple cider vinegar intended to decrease the fly load on horses.
SmartBug-Off Ultra Pellets (SmartPak)
Coat QualityCoat Quality
HealthHealth
HerbHerb
Skin + HairSkin + Hair
SmartBug-Off Ultra Pellets from SmartPak is a pelleted equine supplement intended to help horses who are bothered by flies. This supplement is formulated with garlic and apple cider vinegar intended to decrease the fly load on horses.
SmartCalm Ultra Pellets (SmartPak)
CalmingCalming
Mineral BalanceMineral Balance
StressStress
VitaminsVitamins
SmartCalm Ultra Pellets by SmartPak is a pelleted supplement for horses intended to support proper nervous system function. It contains tryptophan, magnesium and B-vitamins in highly palatable form with no added sugar.
SmartCombo Senior Ultra (SmartPak)
Gut HealthGut Health
Hoof HealthHoof Health
JointsJoints
SeniorSenior
SmartCombo Senior Ultra is a pelleted supplement intended for senior horses containing glucosamine, chondroitin sulfate, hyaluronic acid, MSM, biotin, omega 3 fatty acids, probiotics, prebiotics, and digestive enzymes.
SmartCombo Ultra Pellets (SmartPak)
Coat QualityCoat Quality
Hoof HealthHoof Health
JointsJoints
YeastYeast
This supplement made for horses by SmartPak is meant to support the health of hooves, joints, coat, and digestion. It is pelleted and contains yeast.
SmartComfort Pellets (SmartPak)
HealthHealth
HerbHerb
ImmunityImmunity
JointsJoints
SmartComfort Pellets from SmartPak is a pelleted supplement intended to improve stiffness in older horses. This supplement is formulated with devil's claw, yucca and tumeric intended to provide joint support.
SmartDigest Ultra Pellets (SmartPak)
DigestionDigestion
HealthHealth
HindgutHindgut
NutritionNutrition
SmartDigest Ultra Pellets from SmartPak is a pelleted gut health supplement. SmartDigest Ultra Pellets are formulated with probiotics, prebiotics, and Diamond V® yeast culture intended to promote healthy digestive function.
SmartDigest Ultra Powder (SmartPak)
DigestionDigestion
Gut HealthGut Health
HealthHealth
NutritionNutrition
SmartDigest Ultra Powder from SmartPak is a pelleted gut health supplement. SmartDigest Ultra Powder is formulated with probiotics, prebiotics, and Diamond V® yeast culture intended to promote healthy digestive function.
SmartFlex Rehab Pellets (SmartPak)
ExerciseExercise
JointsJoints
ProteinProtein
RecoveryRecovery
SmartFlex Rehab Pellets is a supplement intended for horses rehabilitating from an injury. It contains glucosamine, chondroitin sulfate, and hyaluronic acid for joints and connective tissue.
SmartFlex Senior Pellets (Smart Pak)
HealthHealth
JointsJoints
NutritionNutrition
SeniorSenior
SmartFlex Senior Pellets from Smart Pak is a pelleted joint supplement. SmartFlex Senior Pellets provides 7000mg of glucosamine, 500mg of chondroitin sulfate, and 50mg of hyaluronic acid intended to support healthy joints.
SmartGain (SmartPak)
DigestionDigestion
IngredientIngredient
NutritionNutrition
YeastYeast
SmartGain from SmartPak is a powdered weight gain equine supplement. SmartGain is formulated with rice bran and coconut meal. This supplement includes added lysine, methionine and threonine intended to support healthy body condition.
SmartGut Pellets (SmartPak)
DigestionDigestion
Gut HealthGut Health
ProbioticProbiotic
UlcersUlcers
SmartGut Pellets is a gut supplement intended to neutralize gastric acid and maintain optimal stomach health. This supplement provides prebiotics, probiotics, and soluble fibre to support a healthy stomach lining.
SmartGut Ultra Pellets (SmartPak)
Gut HealthGut Health
HindgutHindgut
ImmunityImmunity
NutrientsNutrients
SmartGut Ultra Pellets from Smart Pak is a pelleted gut supplement. SmartGut Ultra Pellets are intended for horses with occasional gastric problems. This supplement is formulated with slippery elm intended to soothe the gastrointestinal tract in horses.
SmartHoof® Pellets (SmartPak)
Amino AcidAmino Acid
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
SmartHoof® Pellets by SmartPak is a pelleted hoof supplement containing 25 mg of biotin and methionine, lysine, threonine, and gelatin. This supplement provides the necessary nutrient to grow strong, resilient hooves.
SmartMetabo-Lean Pellets (Smart Pak)
HealthHealth
MetabolismMetabolism
Metabolic SyndromeMetabolic Syndrome
NutritionNutrition
SmartMetabo-Lean Pellets from SmartPak is a pelleted equine supplement intended to help manage insulin resistance in horses. SmartMetabo-Lean Pellets are formulated with magnesium and chromium intended to support proper insulin function in horses.
SmartMuscle Mass (SmartPak)
Amino AcidAmino Acid
Competition HorsesCompetition Horses
MuscleMuscle
PerformancePerformance
SmartMuscle® Mass Pellets is an amino acid supplement for horses, containing branched chain amino acids (BCAAs) and whey protein. It is formulated to support muscle development.
SmartPerform Ultra Pellets (SmartPak)
DigestionDigestion
Gut HealthGut Health
ImmunityImmunity
JointsJoints
SmartPerform Ultra Pellets from SmartPak is a pelleted equine supplement intended to support joint and gut health. SmartPerform Ultra Pellets is formulated with turmeric, resveratrol, glucosamine and chondroitin sulphate which are intended to support gut and joint health in horses.
SmartPituitary Senior Pellets (SmartPak)
HealthHealth
ImmunityImmunity
Metabolic SyndromeMetabolic Syndrome
SeniorSenior
SmartPituitary Senior Pellets from SmartPak is a pelleted equine supplement intended for aged horses with pituitary issues. This supplement is formulated with chasteberry, Vitamin E, Siberian ginseng, and echinacea intended to support immune function in senior horses.
Solution 10-10-10 (Tucker Milling)
EnergyEnergy
GrainsGrains
NutrientsNutrients
PerformancePerformance
Solution 10-10-10 by Tucker Milling is a textured feed specially formulated for mature performance horses. With 10% protein, 10% fat, and 10% fiber, it delivers a balanced nutritional profile that meets energy demands while keeping protein levels moderate.
Solution-12 (Tucker Milling)
Complete FeedComplete Feed
DigestionDigestion
FiberFiber
SeniorSenior
Solution 12 by Tucker Milling is a pelleted feed formulated for senior horses and is intended to be fed alongside forage. It includes lactic acid bacteria and yeast to support digestive health, though the specific inclusion levels are not disclosed.
Solutions 10 Pellet (Right Choice)
Amino AcidAmino Acid
Complete FeedComplete Feed
FatFat
NutritionNutrition
Solutions 10 is a 10% protein and 6% fat pelleted complete feed. This feed is formulated for horses in work and at maintenance. It contains both organic and inorganic sources of minerals, yeast, and added amino acids.
Solutions 10 Textured (Right Choice)
Complete FeedComplete Feed
FatFat
Gut HealthGut Health
NutritionNutrition
Solutions 10 Textured by Right Choice is a textured complete feed containing 10% protein, 10% fat, and 26.5% NSC. It is formulated for horses in work and maintenance.
Solutions 12 Pellet (Right Choice)
Complete FeedComplete Feed
HealthHealth
NutritionNutrition
ProteinProtein
Solutions 12 by Right Choice is a textured complete feed intended for horses at work and maintenance. It contains 12% protein and 8% fat with added yeast and amino acids.
Solutions 12 Textured (Right Choice)
Complete FeedComplete Feed
HealthHealth
NutritionNutrition
ProteinProtein
Solutions 12 Textured is a complete feed with 12% protein and 6% fat. It is formulated using corn, oats, barley, and wheat as energy sources. It also contains soybean as a protein source and soybean oil as a fat source.
Solutions 14 Cube (Right Choice)
Complete FeedComplete Feed
FiberFiber
NutritionNutrition
ProteinProtein
Right Choice Solutions® 14 Cube is a cubed feed with 14% protein intended for horses in work and at maintenance. It provides protein from alfalfa meal and extruded soybeans.
Solutions 14 Low Starch Pellet (Right Choice)
Complete FeedComplete Feed
FiberFiber
Low NSC FeedsLow NSC Feeds
NutritionNutrition
Solutions 14 Low Starch is a pelleted complete feed that contains 14% protein and 7% fat. It is formulated for working and maintenance horses and is marketed as a low NSC feed.
Solutions 14 Pellet (Right Choice)
Complete FeedComplete Feed
HealthHealth
NutritionNutrition
ProteinProtein
Solutions 14 Pellet is a complete feed with 14% protein and 6% fat intended for horses at maintenance or in work. It utilizes alfalfa meal and extruded soybeans for protein.
Solutions 14 Textured (Right Choice)
Complete FeedComplete Feed
HealthHealth
NutritionNutrition
ProteinProtein
Solutions 14 Textured is a complete feed containing 14% protein from soybean and alfalfa meal and 6% fat from soybean oil. It contains whole oats, cracked corn, wheat middling's, and molasses as energy sources.
Spectrum Choice 14% Horse – Pellet (Spectrum Feed Services)
Caloric EnergyCaloric Energy
Complete FeedComplete Feed
NutritionNutrition
Weight IssuesWeight Issues
Spectrum Choice 14% is a pelleted feed containing 14% crude protein and ~55% NSC. It is a low-fat, low-fiber product with a low feeding rate. This feed is intended for adult horses from light to heavy work.
Speed Feed (MAC)
HealthHealth
NutrientsNutrients
NutritionNutrition
PerformancePerformance
Speed Feed by MAC is a feed containing 14% protein and 4% fat, it is intended for all horse types.
SpeedFeed (Dunstan)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
SpeedFeed by Dunstan is a complete textured feed intended to meet the nutrient requirements of racehorses and performance horses. It is formulated using a highly palatable blend of cereals including Oats, Maise, Barley, Lupins, Sugarbeet, Sunflower Seeds, Vegitable Oils and a Vitamin and Mineral premix.
Sport 14 (Banks Mill Feeds)
BroodmareBroodmare
Caloric EnergyCaloric Energy
FatFat
ProteinProtein
Banks' Sport 14 is a high-protein, high-fat textured feed intended for breeding and performance horses. It contains 16.6% NSC with energy sources including wheat middlings, oats, soybean oil, beet pulp, alfalfa meal, and cane molasses.
Sport Horse Grass (Uckele)
Mineral BalanceMineral Balance
NutritionNutrition
Ration BalancerRation Balancer
VitaminsVitamins
Sport Horse Grass is a pelleted vitamin, mineral, and amino acid supplement intended for performance horses consuming a grass-based diet. This supplement is intended to support muscular function, joint/tendon maintenance, and recovery.
Stability (Excel Equine Feeds)
Easy KeeperEasy Keeper
HealthHealth
NutrientsNutrients
NutritionNutrition
Stability is a pelleted feed from Excel Equine Feeds. This feed is intended for horses in any level of work, and stage of life.
Stability EQ (Foxden Equine)
CalmingCalming
HerbHerb
MareMare
StressStress
Stability EQ by Foxden Equine is a powdered supplement intended to support normal mental equilibrium in cycling mares and nervous geldings. It contains ingredients such as raspberry leaf, L-theanine and magnesium.
Stable MAX Performance (Elk Grove Milling)
Complete FeedComplete Feed
MareMare
PerformancePerformance
StallionStallion
Stable MAX Performance is a complete feed from Elk Grove Milling intended for performance horses, stallions, and broodmares. It provides probiotics and 14% protein.
Stable MAX Ultra Mate (Elk Grove Milling)
Complete FeedComplete Feed
Easy KeeperEasy Keeper
ProbioticProbiotic
ProteinProtein
Stable MAX Ultra Mate is a complete feed from Elk Grove Milling intended for easy keepers or horses in light work. It provides probiotics and 30% protein.
Stabul 1 (Anderson Feed Co)
Easy KeeperEasy Keeper
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
Weight IssuesWeight Issues
Stabul™ 1 is a low-starch (5%) and low-sugar (5%) feed intended for easy keepers and horses, ponies and mules with metabolic concerns. It is corn, oats and molasses-free.

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