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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
Intensify Total Advantage (Bluebonnet Feeds)
FiberFiber
Gut HealthGut Health
Mineral BalanceMineral Balance
VitaminsVitamins
Intensify Total Advantage from Bluebonnet Feeds is a pelleted complete feed intended for horses at any life stage. This 11% NSC feed contains alfalfa meal, rice bran, soybean oil, and beet pulp.
Kalm+ Wafer (Majesty’s)
Amino AcidAmino Acid
CalmingCalming
NutrientsNutrients
VitaminsVitamins
Kalm+ is intended to be used as a calming supplement for adult horses and ponies. This diet could be beneficial for horses subjected to frequent travelling or competitions.
Karma: Liquid Calming Supplement (Blue Chip Feed)
CalmingCalming
Competition HorsesCompetition Horses
PerformancePerformance
StressStress
Karma: Liquid Calming Supplement from Blue Chip Feed is designed as a liquid calming supplement that contains water-soluble magnesium, tryptophan, and Niacin. This supplement is intended for performance horses and ponies.
Magnequin (Hestevard)
Amino AcidAmino Acid
CalmingCalming
HealthHealth
VitaminsVitamins
Magnequin by Hestevard is a liquid supplement intended to support a healthy nervous system in all types of horses and ponies.
Omega Advantage (ProElite)
FatFat
GrowthGrowth
Omega 3-6-9Omega 3-6-9
PerformancePerformance
ProElite Omega Advantage is an extruded horse supplement providing 24% fat with added flax. It is intended to provide extra calories and aid in weight gain.
Original Performance Formula (Wilson Feeds)
HealthHealth
NutritionNutrition
PerformancePerformance
Ration BalancerRation Balancer
Original Performance Formula by Wilson Feeds is a soy-free supplement intended to fill nutritional gaps of horses on a forage-based diet.
Parkmore Special Vitamin/Mineral Pelleted Supplement (Parkmore Supplements)
HealthHealth
NutrientsNutrients
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Parkmore Special Vitamin/Mineral Pelleted Supplement is a trace mineral and vitamin supplement designed for all ages and working classes of horses. It can be fed in addition to grain or on its own.
Performance Textured (ProElite)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
PerformancePerformance
StaminaStamina
ProElite Performance Horse Feed is a textured feed intended for mature show and performance horses. It provides 12% fat and 18.3% NSC with energy sources including beet pulp, whole oats, wheat middlings, soybean hulls, and cane molasses.
Pianissimo (Cavalor)
Complete FeedComplete Feed
Easy KeeperEasy Keeper
Metabolic SyndromeMetabolic Syndrome
Ration BalancerRation Balancer
Pianissimo by Cavalor is formulated to be a lower energy feed with lower protein levels and no added oats. This feed is targeted to hot horses to reduce stress.
Pre-Fuel Liquid (Foran Equine)
Competition HorsesCompetition Horses
EnergyEnergy
ExerciseExercise
NutrientsNutrients
Pre-Fuel Liquid from Foran Equine is intended for horses and ponies in heavy work or competition. This supplement is meant to support nutritional and energy requirements.
Pro V.M. (Peak Performance Nutrients)
JointsJoints
MuscleMuscle
PerformancePerformance
StaminaStamina
Pro V.M. by Peak Performance Nutrients is a multi-use vitamin, mineral and amino acid supplement designed with race horses in mind. It intends to support the extreme demands on the horse’s joints, immune system and muscular system.
Professional Farrier’s Choice Hoof Supplement (Vita Stress)
Amino AcidAmino Acid
Hoof HealthHoof Health
ProteinProtein
RecoveryRecovery
Vita Stress Professional Farrier’s Choice Supplement is a hoof supplement containing 14 amino acids. It also supplies biotin and other vitamins important for hoof growth.
ProSetol (Hestevard)
CalmingCalming
Gut HealthGut Health
HealthHealth
RecoveryRecovery
ProSetol by Hestevard is a powdered supplement intended to support nervous horses and ponies.
Pure L-Tryptophan Powder (AniMed)
Amino AcidAmino Acid
CalmingCalming
IngredientIngredient
StressStress
AniMed's Pure L-Tryptophan Powder contains the amino acid tryptophan. This amino acid contributes to mood while relieving panic and anxiety. It is supposed to be 100% digestible.
Re-Inforcer EQ (MVP)
AntioxidantAntioxidant
ExerciseExercise
JointsJoints
RecoveryRecovery
Re-Inforcer EQ by MVP is a pelleted supplement that intends to support joints, cartilage and connective tissue. It contains zinc, manganese and copper that intends to provide antioxidant support.
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.
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.
Rice Bran (Triple Crown)
EnergyEnergy
ExerciseExercise
FatFat
Weight IssuesWeight Issues
Triple Crown Rice Bran Natural is a high-fat horse supplement intended for underweight and hard-working performance horses. It contains added amino acids and calcium.
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.
Senior Active + (Triple Crown)
HealthHealth
NutritionNutrition
SeniorSenior
Weight IssuesWeight Issues
Senior Active + from Triple Crown is an extruded pelleted intended for older horses or hard keepers. This feed is intended for horses with metabolic issues.
Senior Gold (Triple Crown)
DentalDental
DigestionDigestion
FatFat
SeniorSenior
Triple Crown Senior Gold is a grain-free, beet pulp-based soft feed intended for older horses. It contains 14.5% protein, 12.5% fat and 9% NSC. Senior Gold can be mixed with water to form a mash for horses with dental issues or prone to choke.
Senior Textured Feed (ProElite)
DigestionDigestion
Feed EfficiencyFeed Efficiency
PerformancePerformance
SeniorSenior
Pro Elite Senior Textured Feed is a high fat (10%) and protein (14%) senior complete feed. It is appropriate for senior horses that need help maintaining or gaining weight.
Show Ready EQ (Foxden Equine)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
NutrientsNutrients
StressStress
Show Ready EQ by Foxden Equine is a paste supplement intended for performance horses. It contains ingredients such as magnesium proteinate, magnesium citrate, L-tryptophan, and B vitamins to support calm behaviour.
Showman (ProElite)
Complete FeedComplete Feed
Low NSC FeedsLow NSC Feeds
MuscleMuscle
PerformancePerformance
ProElite by Showman is a pelleted, extruded feed intended for mature horses in moderate to intense work. It is intended to be a low glycemic feed for supporting muscle strength.
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.
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.
Starch Wise (ProElite)
Gut HealthGut Health
NutritionNutrition
PerformancePerformance
SeniorSenior
ProElite Starch Wise is a pelleted horse feed with a maximum 14.5% NSC. It is formulated with moderate levels of starch and sugar for mature show and performance horses.
SU-PER Calm Paste (Gateway Products)
CalmingCalming
HerbHerb
NutrientsNutrients
StressStress
SU-PER Calm Paste by Gateway Products is a supplement for horses that helps maintain calmness and supports balanced behaviour. It contains tryptophan, a precursor to serotonin, aiding the brain in coping with stress.
SU-PER Calm Powder (Gateway Products)
CalmingCalming
HerbHerb
Omega 3-6-9Omega 3-6-9
StressStress
SU-PER Calm Powder by Gateway Products is a supplement for horses that helps maintain calmness and supports balanced behaviour. It contains tryptophan, a precursor to serotonin, aiding the brain in coping with stress.
SU-PER Tryptophane Powder (Gateway Products)
Amino AcidAmino Acid
CalmingCalming
Omega 3-6-9Omega 3-6-9
StressStress
SU-PER Tryptophane Powder by Gateway Products is a supplement to maintain calmness and support balanced behaviour. This supplement contains tryptophan, an amino acid that promotes a calming effect for nervous, excited, or stressed horses.
Super Amino 66 (Hygain)
Amino AcidAmino Acid
Mineral BalanceMineral Balance
MuscleMuscle
VitaminsVitamins
Super Amino 66 from Hygain is a protein supplement containing 10 amino acids. It is intended to support muscle health and also contains vitamins and minerals.
Super So-Kalm Powder (Equine America)
Amino AcidAmino Acid
CalmingCalming
Mineral BalanceMineral Balance
StressStress
Super So-Kalm Powder from Equine America is a concentration and focus supplement for horses. It is intended to assist with calming and reducing stress and it contains minerals.
Support Pro (Formula 707)
CalmingCalming
DigestionDigestion
Gut HealthGut Health
UlcersUlcers
Support Pro from Formula 707 is a pelleted supplement that is intended to support digestion, stomach and hindgut health. It is also meant for calming or ulcer support.
SupportPRO (Horse Logic Pro) – [Discontinued]
Competition HorsesCompetition Horses
Gut HealthGut Health
HealthHealth
ImmunityImmunity
SupportPRO from Horse Logic Pro is a pelleted gut supplement. SupportPRO is intended to provide hindgut support to horses who struggle with gastric issues during periods of stress. SupportPRO contains 12% crude protein and 1.25% fat.
Tie Free TMC Paste (Peak Performance Nutrients)
ExerciseExercise
MuscleMuscle
RecoveryRecovery
StressStress
Tie Free TMC Paste is a sodium bicarbonate free electrolyte supplement that supports replenishment of glycogen stores, muscle recovery, and muscles prone to tying up. It contains potassium chloride, potassium carbonate, and magnesium sulphate.
TNT For Horses (Dynamite Equine)
HealthHealth
ImmunityImmunity
NutritionNutrition
VitaminsVitamins
TNT For Horses from Dynamite Equine is a pelleted equine supplement. TNT For Horses is intended to support overall equine health. This supplement contains 18% protein and 8% fat.
Top-Line Advanced Support (Progressive Nutrition)
Amino AcidAmino Acid
HealthHealth
MuscleMuscle
ToplineTopline
Top-Line Advanced Support is an amino acid supplement from Progressive Nutrition intended to support muscle and topline development in horses. It contains L-lysine, L-threonine, L-methionine, L-leucine, L-valine, L-isoleucine, and L-tryptophan.
Top-Line Xtreme (ProElite)
Amino AcidAmino Acid
MuscleMuscle
ProteinProtein
ToplineTopline
Top-Line Xtreme is a topline supplement that includes high levels of protein and amino acids. It is meant to support the health of horses' topline, muscles, and recovery processes. It is flavored and in micro-pellet form.
Topline Advantage (ProElite)
DigestionDigestion
NutritionNutrition
ProteinProtein
ToplineTopline
ProElite Topline Advantage is a pelleted horse supplement that provides essential nutrients and amino acids for muscle development. It contains 50% crude protein.
Tryptophan
Amino AcidAmino Acid
IngredientIngredient
MetabolismMetabolism
MuscleMuscle
Tryptophan is an amino acid that is a precursor for serotonin and melatonin. It is sometimes supplemented to horses as a calming aid. However, research in horses suggests that it is not an effective calming additive.
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.
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.
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.
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.
Whoa (Doctor’s Choice Supplements)
CalmingCalming
Mineral BalanceMineral Balance
StressStress
VitaminsVitamins
Whoa by Doctor's Choice Supplements is a supplement intended for horses with limited exercise programs or on box rest. It is designed to help with a horse's focus and attitude.
Wilson’s Cool Formula (Wilson Feeds)
Mineral BalanceMineral Balance
NutrientsNutrients
ProteinProtein
YeastYeast
Wilson's Cool Formula by Wilson Feeds is a granular, textured horse feed formulated to balance forage-based diets. It is soy-free and contains peas and alfalfa as protein sources.

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