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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.
Mare Support (Pureform)
CalmingCalming
MareMare
Mineral BalanceMineral Balance
VitaminsVitamins
Mare Support is a vitamin/mineral supplement formulated for horses on a grass-based diet. It contains glucosamine and MSM for joint health, B-vitamins, organic microminerals and vitex agnus-castus (chasteberry).
Mare-Foal II-P (Pellets) (MVP)
BroodmareBroodmare
FoalFoal
Mineral BalanceMineral Balance
VitaminsVitamins
Mare-Foal II-P by MVP is a pelleted supplement designed for broodmares and foals. It contains vitamins, minerals, probiotics and an elevated protein level that intend to support proper development.
Mare’s Milk Plus (Buckeye)
EnergyEnergy
FoalFoal
NutritionNutrition
ProteinProtein
Mares Milk Plus is a powdered milk replacer for nursing, orphaned or rejected foals. It contains digestible, whey-based proteins to minimize digestive upset and is fully fortified.
Mare’s Milk Replacer (Baileys Horse Feeds)
FoalFoal
GrowthGrowth
NutritionNutrition
ProteinProtein
Mare's Milk Replacer from Baileys Horse Feeds is intended for orphaned or rejected foals after receiving colostrum. This feed contains milk protein, vitamins, and minerals vital for the foal's optimum growth.
Mare’s Match® Foal Transition Pellets (Land O Lakes)
FatFat
FoalFoal
GrowthGrowth
ProteinProtein
Mare's Match® Foal Transition Pellets is a milk-based feed targeted to weanlings transitioning to solid feed. It is a source of protein, fat, vitamins and minerals.
MareKare (AniMed)
BroodmareBroodmare
LactationLactation
NutrientsNutrients
VitaminsVitamins
MareKare from AniMed is a made for pregnant and lactating mares. This vitamin and mineral supplement is meant to provide extra nutrients and help maintain body condition during breeding, foaling, and lactating.
Mass-No-Sass (Daily Dose Equine)
DigestionDigestion
FiberFiber
ForageForage
Weight IssuesWeight Issues
Mass-No-Sass by Daily Dose Equine is a hay-based feed with high fat and fibre. It is intended to be digested in the foregut, allowing a horse to maintain focus and calm during training.
Master’s Hoof Blend (Vita Flex)
Amino AcidAmino Acid
Hoof HealthHoof Health
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Master's Hoof Blend from Vita Flex is a hoof supplement containing the essential amino acids lysine and methionine, and biotin. It also contains sulfur and chelated trace minerals to support hoof growth and integrity.
Materna (Sollio Agriculture)
GrowthGrowth
HealthHealth
MareMare
NutritionNutrition
Materna is a pelleted feed intended for broodmares during lactation and gestation. This feed is intended to promote the development of the fetus. Materna contains 16% crude protein.
Materna TXT (Sollio Agriculture)
BroodmareBroodmare
EnergyEnergy
GrowthGrowth
HealthHealth
Materna TXT is a textured sweet feed intended for foals and lactating mares. This feed is intended to provide energy and protein to support milk production and foal growth.
Mature Horse (Bar Ale)
Complete FeedComplete Feed
JointsJoints
NutritionNutrition
SeniorSenior
Mature Horse is intended to support overall health and nutrient requirements for an adult to a senior horse. It contains glucosamine which is meant to support joint health.
Maxim Low-GI (Dunstan)
FiberFiber
HealthHealth
Low NSC FeedsLow NSC Feeds
NutritionNutrition
Maxim Low-GI by Dunstan is a high fibre feed formulated to be low in starch and sugar. It is intended for horses that do not do well on grain-based feeds.
Mega Dose (Horse Guard)
DigestionDigestion
Gut HealthGut Health
Mineral BalanceMineral Balance
VitaminsVitamins
Mega Dose by Horse Guard is a supplement that contains vitamins, minerals, and probiotics. It is intended to assist with digestion, gut health and hoof health.
Mega Power Pak Paste (Peak Performance Nutrients)
EnergyEnergy
PerformancePerformance
RespiratoryRespiratory
StaminaStamina
Mega Power Pak Paste by Peak Performance Nutrients is a powdered supplement containing a blend of herbs and amino acids. This supplement intends to support horses' respiratory health.
Mega-Blud (Equistro)
HealthHealth
IngredientIngredient
PerformancePerformance
VitaminsVitamins
Mega-Blud from Equistro is a powdered booster dose of Vitamin A, E, and D. Mega-Blud is intended to support the function of musculoskeletal, immune, and nervous systems.
Mega-Cell MVP – Pelleted Multi Vitamin and Mineral (Med-Vet)
HealthHealth
ProbioticProbiotic
Ration BalancerRation Balancer
VitaminsVitamins
MVP Mega-Cell is a pelleted vitamin and mineral supplement for horses formulated to balance grass hays and grain-based diets. It is also a source of amino acids and microbials.
Mega-FLX + HA (Spectra)
ExerciseExercise
JointsJoints
MuscleMuscle
RecoveryRecovery
Mega-FLX + HA is an equine supplement intended for targeting joint and muscle health. This liquid formulation contains vitamins, and minerals as well as MSM and hyaluronic acid.
Mega-Mag (Pellets) (MVP)
Amino AcidAmino Acid
Mineral BalanceMineral Balance
ProbioticProbiotic
VitaminsVitamins
Mega-Mag by MVP is a pelleted supplement designed for alfalfa hay/grain diets that provide vitamins, minerals, amino acids, and probiotics intended horses of all life stages.
Mellow Muscle (Sierra Gold)
CalmingCalming
Mineral BalanceMineral Balance
MuscleMuscle
VitaminsVitamins
Mellow Muscle by Sierra Gold is a powdered supplement for horses intended to aid horses suffering from PSSM. It contains vitamins, minerals, and amino acids which intend to support muscle growth.
Meta Safe (Hygain)
ImmunityImmunity
MetabolismMetabolism
Ration BalancerRation Balancer
Weight IssuesWeight Issues
Meta Safe from Hygain is a ration balancer pellet for horses. Meta Safe is intended for horses on a restricted diet or suffering from metabolic issues. This feed contains 6.5% NSC.
Metabolic Miracle (Aterak Nutrition)
Grain FreeGrain Free
Metabolic SyndromeMetabolic Syndrome
Mineral BalanceMineral Balance
VitaminsVitamins
Metabolic Miracle by Aterak Nutrition is a feed targeted toward horses or ponies with metabolic disorders (Cushing's, Founder, Laminitis). This feed contains the vitamins and minerals necessary to support a well-balanced diet and is high in fibre.
MetaBoost (Pureform)
Amino AcidAmino Acid
AntioxidantAntioxidant
ToplineTopline
VitaminsVitamins
MetaBoost from Pureform is a supplement for horses that contains antioxidants, vitamins, amino acids and minerals. It is meant to support digestion, muscles, and topline.
MetaStable Pellets (Formula 707)
Amino AcidAmino Acid
HealthHealth
MetabolismMetabolism
Metabolic SyndromeMetabolic Syndrome
MetaStable Pellets by Formula 707 is a metabolic supplement designed to support healthy blood sugar balance and promote weight loss. It contains added leucine and pyridoxine (Vitamin B6) to enhance insulin sensitivity and aid in glucose regulation.
Methionine
Amino AcidAmino Acid
ExerciseExercise
Hoof HealthHoof Health
JointsJoints
Methionine is an essential amino acid that is considered the second or third limiting amino acid in the horse's diet. It is necessary for protein synthesis and has numerous bodily roles, including antioxidant production, hoof growth, coat quality, and protein synthesis.
MFM Pellet (Kentucky Equine Research)
Amino AcidAmino Acid
HealthHealth
MuscleMuscle
RecoveryRecovery
MFM Pellet is a supplement that is made to assist with muscle recovery and repair and contains amino acids.
Microfeed (Dodson & Horrell)
Amino AcidAmino Acid
ExerciseExercise
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
Microfeed is a feed designed for racehorses in full training. This feed is high in NSC to give the horses an energy boost. It is also high in protein for proper muscle building and includes some yeast for good digestive function.
Milestone Compete Horse Food (Muenster)
Coat QualityCoat Quality
Competition HorsesCompetition Horses
FatFat
MuscleMuscle
Complete Horse Food is intended to promote muscle growth and function. It is ideal for performance horses and breeding stock as extra calories and energy are needed.
Milestone Foal Horse Food (Muenster)
FiberFiber
FoalFoal
GrowthGrowth
ProteinProtein
Foal Horse Food is intended for horses and ponies under the age of 1. The diet includes nutrients needed for normal growth and development.
Milestone Life Horse Food (Muenster)
Caloric EnergyCaloric Energy
FiberFiber
GrainsGrains
Hay StretcherHay Stretcher
Life Horse Food is designed to be a hay replacer and provide nutrients to horses and ponies of all ages. It is ideal for horses that are in moderate work.
Milestone Life Plus Horse Food (Muenster)
FatFat
FiberFiber
GrainsGrains
Omega 3-6-9Omega 3-6-9
Life Plus is a pelleted feed intended to provide additional energy and nutrients to all horses and ponies. It is also suitable for performance horse and breeding horses as they need extra essential nutrients.
Milestone Optimize Horse Supplement (Muenster)
FatFat
NutritionNutrition
Omega 3-6-9Omega 3-6-9
Weight IssuesWeight Issues
Optimize Horse Supplement is a high-fat feed intended to provide more energy to breeding horses and performance horses. It contains nutrient dense ingredients such as coconut meal and flaxseed.
Milestone Senior Horse Food (Muenster)
FatFat
FiberFiber
MareMare
SeniorSenior
Milestone Senior Horse Food is a pelleted feed intended for older horses in light to moderate work. It is suitable as a supplemental feed when forage availability is limited. It contains high fiber, low starch, alfalfa, coconut, flax, and algae meal.
Milk & Grow Pellets (Uckele)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Milk & Grow Pellets is a vitamin, mineral, probiotic, and amino acid pelleted supplement formulated for lactating and gestating mares as well as growing foals that have increased nutrient demands.
Miniature Horse and Pony (Purina)
EnergyEnergy
Gut HealthGut Health
NutritionNutrition
ProteinProtein
Purina® Miniature Horse and Pony is a pelleted concentrate feed intended for all classes of miniature horses and ponies. These animals have different metabolic needs compared to other horses.
Mintrex Mn (Novus International)
Bone HealthBone Health
HealthHealth
IngredientIngredient
Organic Trace MineralsOrganic Trace Minerals
MINTREX® Mn is a highly bioavailable chelated organic manganese supplement used in livestock feeds. Organic trace minerals are better absorbed and utilized in the horse's body.
Mintrex R 2.0 (Novus International)
Mineral BalanceMineral Balance
NutritionNutrition
Organic Trace MineralsOrganic Trace Minerals
ProteinProtein
Mintrex R 2.0 is an organic trace mineral supplement containing chelated zinc, copper and manganese in an amino-acid complex with methionine. It also supplies ascorbate (Vitamin C).
Moore Power 12-8 (Thomas Moore Feed)
FatFat
Mineral BalanceMineral Balance
NutritionNutrition
ProteinProtein
Moore Power 12-8 by Thomas Moore Feed is a pelleted feed that contains 12% protein and 8% fat. It is intended to balance the diet, assist with body conditioning, and contains vitamins and minerals.
Moore Power 14-10 (Thomas Moore Feed)
EnergyEnergy
GrowthGrowth
NutrientsNutrients
PerformancePerformance
Moore Power 14-10 from Thomas Moore Feed is a high energy feed that is intended for breeding, growing, or performance horses. It contains protein, fat, fiber, vitamins and minerals.
Moore Power Senior (Thomas Moore Feed)
Mineral BalanceMineral Balance
NutrientsNutrients
SeniorSenior
VitaminsVitamins
Moore Power Senior from Thomas Moore Feed is a feed meant for senior horses. It contains minerals, vitamins, fiber and protein. It is intended to assist with maintenance of senior horses.
MoviCur (St.Hippolyt)
HealthHealth
JointsJoints
PerformancePerformance
RecoveryRecovery
MoviCur by St.Hippolyt is a supplement intended to support the overall health of tendons, ligaments and joints in horses.
MuesliMax (Hallway)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
EnergyEnergy
FatFat
MuesliMax from Hallway is a sweet feed fortified with Stamm 30 formulated for high-performance horses with high energy needs. This feed provides energy from oats, barley, vegetable oil, and black sunflower seeds. MuesliMax contains 11% protein, 8% fat, and 10% fibre.
Multi-Max (West Feeds)
GrainsGrains
Mineral BalanceMineral Balance
NutritionNutrition
ProteinProtein
VitaminsVitamins
Multi-Max by West Feeds is a top-dressed supplement meant to support most livestock production animals, with a high level of protein of 28%. The ingredients in this feed include inorganic vitamins and minerals and yeast strains to increase digestibility.
Multi-Species Milk Replacer (Hubbard Feeds)
Bone HealthBone Health
FoalFoal
GrowthGrowth
NutritionNutrition
Hubbard® Life Multi-Species Milk Replacer supplies complete nutrition for foals, goat kids, lambs, calves and piglets. It is used to replace or supplement mother's milk with all-milk protein sources and high fat.
MultiSentials 1:1 (Sentinel Care)
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
PerformancePerformance
VitaminsVitamins
MultiSentials 1:1 by Sentinel Care is a complete granular supplement formulated to correct nutritional deficiencies caused by hay and pasture-based diets. It is suitable for all classes of working horses
Muscle EQ (Uckele)
GrowthGrowth
MuscleMuscle
PerformancePerformance
RecoveryRecovery
Muscle EQ by Uckele is a powdered supplement that provides a blend of amino acids that intend to aid in muscle development, support, and strength. It contains ingredients such as acetyl l-carnitine HCL, l-leucine, and beta-alanine.
Muscle Maintenance (GWF Nutrition)
HealthHealth
MuscleMuscle
ProteinProtein
ToplineTopline
Muscle Maintenance by GWF Nutrition is a pelleted supplement to assist in muscle replenishment, minimize muscle fatigue and tissue breakdown. It is suitable for horses and ponies.
Muscle Recharge (Bluebonnet Feeds)
CirculationCirculation
EnergyEnergy
ImmunityImmunity
MuscleMuscle
Muscle Recharge by Bluebonnet Feeds is a powdered supplement intended to support muscle stamina and function in performance horses.
Muscle-Aid (Multivet USA Inc)
Amino AcidAmino Acid
ExerciseExercise
MuscleMuscle
RecoveryRecovery
Muscle-Aid by Multivet USA Inc is a supplement intended to aid with the strength and repair of muscles in horses.
Muscle-UP (AniMed)
ElectrolyteElectrolyte
ExerciseExercise
MuscleMuscle
RecoveryRecovery
AniMed Muscle-UP Powder is a horse supplement targeted to performance horses. It is advertised to support muscle recovery, normal lactic acid levels, proper electrolyte balance and body fluid levels.
Muscle-UP Max Performance (AniMed)
Amino AcidAmino Acid
HealthHealth
MuscleMuscle
PerformancePerformance
Muscle-UP Max Performance from AniMed is a supplement meant to help with proper muscle function and health. It can also help with a horse's overall health and physical condition.

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