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L-Tryptophan - Feed Ingredient

L-Tryptophan is an essential amino acid required for protein synthesis and various metabolic functions in horses. It serves as a precursor for serotonin, a neurotransmitter involved in mood regulation and nervous system function. Due to this role, L-Tryptophan is sometimes included in equine supplements marketed for calming or stress support. However, its effectiveness as a calming agent in horses has not been scientifically proven, and serotonin synthesis is a complex process influenced by multiple factors beyond dietary tryptophan intake.

Horses obtain L-Tryptophan naturally from protein-containing feedstuffs such as forages and grains. While dietary supplementation may be used in specific situations, such as for horses prone to stress or nervous behavior, research does not conclusively support its calming effects.

The following equine feeds, supplements and products contain L-Tryptophan as an ingredient.

Feeds, Supplements & Products
Alfalfa Advantage (ProElite)
Mineral BalanceMineral Balance
NutritionNutrition
Ration BalancerRation Balancer
VitaminsVitamins
ProElite Alfalfa Advantage is a low-feeding rate pelleted ration balancer intended to balance diets composed of alfalfa forages. It can be fed to all classes of horses.
AlfaMax RX (Alfamax Feed)
Complete FeedComplete Feed
DigestionDigestion
HealthHealth
Low NSC FeedsLow NSC Feeds
AlfaMax RX from Alfamax Feed is a complete pelleted feed. AlfaMax RX contains no soybean meal & is intended for horses' requiring a low NSC content (starch + sugars).
Amino Edge (Bluebonnet Feeds)
Amino AcidAmino Acid
MuscleMuscle
Omega 3-6-9Omega 3-6-9
PerformancePerformance
Amino Edge by Bluebonnet Feeds is an amino acid supplement that also includes antioxidants and essential fatty acids. It is intended to support muscle and performance.
At-Ease (Select the Best)
Amino AcidAmino Acid
CalmingCalming
Mineral BalanceMineral Balance
VitaminsVitamins
At-Ease is a horse supplement purported to promote a calm mood. It is formulated with the B-vitamins, thiamine, and pyridoxine. It also includes the amino acid tryptophan and magnesium oxide.
B-Gooood!! (Doctor’s Choice Supplements)
Amino AcidAmino Acid
CalmingCalming
Mineral BalanceMineral Balance
StressStress
B-Gooood is a pelleted supplement intended for horses and ponies that need a mood enhancer to help them stay focused. It is designed for mare and geldings on a limited exercise program or on stall rest.
Balancer Gold (Triple Crown)
Easy KeeperEasy Keeper
Low NSC FeedsLow NSC Feeds
Metabolic SyndromeMetabolic Syndrome
Ration BalancerRation Balancer
Balancer Gold is a soy-free ration balancer with 13.5% protein, 4.5% fat and 14.2% NSC. It has a lower feeding rate and can be used alone or in combination with other complete feeds or feed ingredients.
BetaCALM Paste (Kelato)
Amino AcidAmino Acid
CalmingCalming
HerbHerb
StressStress
BetaCALM Paste from Kelato is a supplement given by syringe that is meant to calm stressed or anxious horses quickly. It contains tryptophan and herbal ingredients.
BetaCALM Powder (Kelato)
CalmingCalming
Mineral BalanceMineral Balance
StressStress
VitaminsVitamins
BetaCALM Powder from Kelato is a supplement that is meant to calm anxiety and stress. It is a source of thiamine, magnesium, tryptophan, and vitamin E.
BiAaMuGen (Hoffman’s Horse Products)
Amino AcidAmino Acid
Competition HorsesCompetition Horses
HealthHealth
StaminaStamina
BiAaMuGen from Hoffman's Horse Products is a pelleted protein supplement for horses intended to be fed top-dressed. BiAaMuGen is intended to be fed to horses who require additional muscle mass.
Blitz! Pak (Peak Performance Nutrients)
ElectrolyteElectrolyte
HerbHerb
Mineral BalanceMineral Balance
VitaminsVitamins
Blitz! Pak by Peak Performance Nutrients is a vitamin and mineral supplement which is intended to be provided before a horse event. It contains electrolytes, amino acids, and a blend of herbs.
Calm (Cavalor)
CalmingCalming
HerbHerb
NutrientsNutrients
StressStress
Cavalor Calm is a powdered calming equine supplement composed of B vitamins, tryptophan, and magnesium intended to support mood balance. This makes it ideal for young or nervous horses and ponies.
Calmex (Powder) (MVP)
Amino AcidAmino Acid
CalmingCalming
Mineral BalanceMineral Balance
StressStress
Calmex by MVP is a powdered supplement for horses that intends to support nervous system function to minimize anxious behaviour. Its intended use is for competition, training and trailering.
Calmex-V (MVP)
Amino AcidAmino Acid
CalmingCalming
HerbHerb
StressStress
Calmex-V by MVP is a powdered supplement for horses that contains ingredients such as valerian root and tryptophan that intend to help support balanced behaviour.
Calmex-V (Paste) (MVP)
Amino AcidAmino Acid
CalmingCalming
HerbHerb
StressStress
Calmex-V by MVP is a paste supplement that contains ingredients such as valerian root and tryptophan that intend to help support balanced behaviour. This paste is intended for travelling and anxiety-causing scenarios.
Calminex (Basic Equine Nutrition)
Amino AcidAmino Acid
CalmingCalming
Mineral BalanceMineral Balance
VitaminsVitamins
Calminex is marketed as a calming supplement that contains tryptophan, thiamin, niacin, and magnesium. It also contains yeast and prebiotics for gut health. This supplement may be beneficial for horses easily stressed or at a high performance level.
Calming Pellets (Formula 707)
CalmingCalming
HealthHealth
NutrientsNutrients
StressStress
Calming Pellets by Formula 707 is a calming supplement intended to support a balanced nervous system in horses.
Calming Pro Complete (Formula 707)
CalmingCalming
DigestionDigestion
Gut HealthGut Health
StressStress
Calming Pro Complete from Formula 707 is a pelleted calming supplement. It is meant to support digestion, stomach health, and nervous system health.
Calming PRO Paste (Horse Logic Pro)
CalmingCalming
Competition HorsesCompetition Horses
HealthHealth
ImmunityImmunity
Calming PRO Paste from Horse Logic Pro is a calming paste for horses. Calming Pro Paste contains L-tryptophan which is intended to decrease anxiety in horses during stressful situations.
CalmingPRO Pellets (Horse Logic Pro) – [Discontinued]
CalmingCalming
Competition HorsesCompetition Horses
HealthHealth
StressStress
CalmingPRO Pellets from Horse Logic Pro is a pelleted calming supplement for horses. CalmingPRO Pellets contain magnesium, thiamine, and L-tryptophan intended to have calming effects on horses.
DeStress Equine (Hoffman’s Horse Products)
MuscleMuscle
NutrientsNutrients
StressStress
Weight IssuesWeight Issues
DeStress Equine from Hoffman's Horse Products is a pelleted supplement that is meant to help with the stress of being handling or transported. It contains electrolytes, amino acids, and aims to reduce weight and increase muscle development.
Diamond Balancer (Triple Crown)
Easy KeeperEasy Keeper
Grain FreeGrain Free
Metabolic SyndromeMetabolic Syndrome
NutrientsNutrients
Diamond Balancer by Triple Crown is a grain-free pelleted balancer formulated for adult horses with metabolic concerns. It provides 14% protein, 3% fat, and 15% fiber (as fed).
Diamond Perform (Triple Crown)
AntioxidantAntioxidant
FatFat
Gut HealthGut Health
PerformancePerformance
Diamond Perform from Triple Crown is a pelleted feed that is high in fat and fiber. It is intended for performance horses and is meant to assist with gut health and immunity.
Diamond Senior (Triple Crown)
FatFat
FiberFiber
NutrientsNutrients
SeniorSenior
Diamond Senior by Triple Crown is a high-fat, high-fiber feed specifically formulated for senior horses. It includes beet pulp as a fermentable fiber source to support optimal calorie intake.
Dragon Paste (Equine Choice)
CalmingCalming
HealthHealth
PerformancePerformance
StressStress
Dragon Paste by Equine Choice is a calming supplement designed for performance horses. It is formulated with amino acids, magnesium citrate, casein and probiotics.
Easy Boy (Dynamite)
CalmingCalming
Competition HorsesCompetition Horses
HealthHealth
StressStress
Easy Boy is a calming supplement for horses from Dynamite. This supplement contains chelated magnesium and B-vitamins, intended to decrease nervous behaviour in horses.
Elements (ProElite)
Amino AcidAmino Acid
HealthHealth
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Elements by Pro Elite is a powdered supplement that provides essential vitamins, minerals, and amino acids for horses on a forage-only diet.
Elite Equine Cool (Elite Three)
Caloric EnergyCaloric Energy
FatFat
Omega 3-6-9Omega 3-6-9
Weight IssuesWeight Issues
Elite Equine Cool by Elite Three is a textured supplement that provides moderate fat and protein levels from hemp seed meal. It is highly digestible, easy on the gut, and supports digestive health and relaxation.
Empower® Topline Balance® Ration Balancer (Nutrena)
Amino AcidAmino Acid
Grain FreeGrain Free
Ration BalancerRation Balancer
ToplineTopline
Nutrena Empower® Topline Balance® is a concentrated ration balancer to support topline and provide common nutrients lacking in forage. It contains 30% crude protein with added limiting amino acids.
Equilene Complete (Bluebonnet Feeds)
BroodmareBroodmare
Complete FeedComplete Feed
Gut HealthGut Health
PerformancePerformance
Equilene Complete from Bluebonnet is a feed that is meant to be used as a forage replacer, designed for horses at all life stages. This feed provides 10% starch, and 4% sugar.
Equilene Pelleted (Bluebonnet Feeds)
Gut HealthGut Health
Mineral BalanceMineral Balance
ProteinProtein
VitaminsVitamins
Equilene Pelleted from Bluebonnet is a feed intended for horses at all life stages, including breeding, and performance horses. This feed contains 11% starch, 5% sugars, and uses a mix of organic and inorganic trace minerals.
EquiModium (AniMed)
Amino AcidAmino Acid
DigestionDigestion
Gut HealthGut Health
Mineral BalanceMineral Balance
This supplement from AniMed is meant to support digestion and gastrointestinal health in horses. It is powder, and can be used for any horse, but recommended to be used only when needed.
Ex Stress Elite (Peak Performance Nutrients)
CalmingCalming
Competition HorsesCompetition Horses
PerformancePerformance
StressStress
Ex Stress Elite by Peak Performance Nutrients is a supplement containing magnesium, B vitamins, and electrolytes. It is meant to help horses replace the nutrients they lose when in stressful situations.
Farrier’s Best Friend (Pegasus)
Bone HealthBone Health
HealthHealth
Hoof HealthHoof Health
Skin + HairSkin + Hair
Farrier's Best Friend from Pegasus is meant to support hoof, skin, and hair health. This supplement contains biotin, zinc, methionine, and calcium.
ForeCalm Paste (Forefront Equine)
CalmingCalming
HerbHerb
NutrientsNutrients
StressStress
ForeCalm Paste is a calming supplement intended for horses and ponies involved in stressful situations. It contains magnesium , taurine, L-Tryptophan, thiamine, and organic hemp seed.
ForeCalm Powder (Forefront Equine)
Amino AcidAmino Acid
CalmingCalming
HerbHerb
StressStress
ForeCalm Powder is a calming supplement intended for horses and ponies involved in stressful situations. It contains taurine, magnesium, organic hemp, raspberry leaf, thiamine, and tryptophan.
Formula Calm B (DAC)
CalmingCalming
Competition HorsesCompetition Horses
PerformancePerformance
VitaminsVitamins
Formula Calm B from dac is intended to promote balanced behaviour in horses. This supplement is intended to help horses relax. Formula Calm B contains B-Vitamins, Magnesium and Tryptophan.
GI Intensive Care (Bluebonnet Feeds)
DigestionDigestion
Gut HealthGut Health
HealthHealth
NutritionNutrition
GI Intensive Care by Bluebonnet Feeds is a powdered supplement intended to provide digestive support for horses undergoing stress, changes in diet, environment or schedule.
Good As Gold (TRM)
Amino AcidAmino Acid
CalmingCalming
PerformancePerformance
StressStress
Good As Gold from TRM promotes relaxation in horses. Good As Gold contains 6000mg of tryptophan per 50g with added antioxidants and thiamine.
Good As Gold + MAG (TRM)
Amino AcidAmino Acid
CalmingCalming
Competition HorsesCompetition Horses
StressStress
Good As Gold + Mag from TRM is a calming supplement for horses containing magnesium and tryptophan which can reduce stress reactions. Good As Gold + Mag is formulated to aid horses who are nervous or high-strung.
Good As Gold Paste (TRM)
Amino AcidAmino Acid
CalmingCalming
PerformancePerformance
StressStress
Good As Gold Paste helps promote relaxed behaviour in horses. Good As Gold Paste contains L- tryptophan, magnesium and B vitamins to support the nervous or high-strung horse.
Grass Advantage (ProElite)
Mineral BalanceMineral Balance
NutritionNutrition
Ration BalancerRation Balancer
VitaminsVitamins
ProElite Grass Advantage is a pelleted ration balancer intended to balance grass and mixed forages. It can be fed to broodmares, growing, performance, and maintenance horses.
Growth Textured (ProElite)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
ProElite Growth Horse Feed is a textured feed intended for foals, growing horses, and broodmares. It provides 16% protein to support development with a maximum NSC of 19.8%.
H-Formula (Biopteq)
HealthHealth
ImmunityImmunity
JointsJoints
MuscleMuscle
H-Formula from Biopteq is a pelleted supplement intended for horses who require additional protein in their diet. This supplement is intended to support the maintenance of muscles and tendons.
Harmony (DePaolo Equine Concepts)
Amino AcidAmino Acid
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
Harmony from DePaolo Equine Concepts is a powdered supplement that aims to provide an even temperament in horses. It can also balance hormone levels and support a healthy endocrine system.
Hoof Formula (Kevin Bacon’s Horse Care) – [Discontinued]
Amino AcidAmino Acid
Competition HorsesCompetition Horses
Hoof HealthHoof Health
Mineral BalanceMineral Balance
Hoof Formula from Kevin Bacon's Horse Care is a now discontinued hoof supplement that supports hoof growth and quality. It contains added protein, calcium, vitamin A, biotin and other minerals.
Intensify Ex-Factor Low Starch (Bluebonnet Feeds)
Complete FeedComplete Feed
Low NSC FeedsLow NSC Feeds
Mineral BalanceMineral Balance
VitaminsVitamins
Intensify Ex-Factor Low Starch by Buebonnet Feeds is an extruded feed intended for horses at all life stages and exercise levels. It contains10% NSC and organic minerals and yeast. Extruded feeds tend to have higher digestibility.
Intensify Growth & Development (Bluebonnet Feeds)
BroodmareBroodmare
GrowthGrowth
LactationLactation
ProteinProtein
Intensify Growth & Development by Bluebonnet Feeds is a pelleted feed intended for broodmares and growing horses. This feed provides 16% protein, 10% fat, and 18% NSC.
Intensify Omega Force (Bluebonnet Feeds)
Caloric EnergyCaloric Energy
FatFat
Omega 3-6-9Omega 3-6-9
ProteinProtein
Intensify OmegaForce by Bluebonnet Feeds is a pelleted complete feed with flax seed and fish oil for added omega-3s. Intensify OmegaForce is intended for horses at all lifestages.
Intensify Pelleted (Bluebonnet Feeds)
Complete FeedComplete Feed
Gut HealthGut Health
Mineral BalanceMineral Balance
VitaminsVitamins
Intensify Pellet from Bluebonnet is a feed intended for horses at all life stages. It contains 14% protein, 8% fat, and 15% fibre, and uses a mix of organic and inorganic trace minerals.
Intensify Senior Therapy (Bluebonnet Feeds)
Gut HealthGut Health
Mineral BalanceMineral Balance
SeniorSenior
VitaminsVitamins
Intensify Senior Therapy from Bluebonnet Feeds is a textured feed intended for senior horses. This feed contains alfalfa meal, rice hulls, soybean meal, cane molasses, beet pulp, and a mix of organic and inorganic trace minerals.

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