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Muscle Supplements for Horses

View a list of the best muscle supplements for horses in the Mad Barn Equine Feed Database. This category includes commercial products formulated to support muscle growth, topline development, lean tissue maintenance, strength, stamina, and post-exercise recovery.

Compare ingredient lists, guaranteed analyses, feeding directions, and nutritional profiles for equine muscle supplements, including amino acids, protein supplements, vitamin E, selenium, magnesium, omega-3s, and recovery formulas. Use this database to evaluate products for performance horses, growing horses, seniors, hard keepers, and horses rebuilding topline after time off.

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Muscle Supplements
Acetyl-L-Carnitine (Mad Barn)
AntioxidantAntioxidant
ExerciseExercise
MuscleMuscle
StallionStallion
Acetyl-l-carnitine (ALCAR) is a performance horse supplement that supports energy metabolism, muscle function and neural health. This powdered supplement has a low feeding rate and is generally well accepted by horses.
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.
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.
Magnesium Oxide (Mad Barn)
CalmingCalming
HealthHealth
IngredientIngredient
MuscleMuscle
Magnesium Oxide is a concentrated source of magnesium that can be added to equine diets to help maintain adequate magnesium intake. Magnesium supports normal muscle and nerve function and plays a role in electrolyte balance, energy metabolism, and overall neuromuscular health.
Natural E/Organic Se (Mad Barn)
AntioxidantAntioxidant
Organic Trace MineralsOrganic Trace Minerals
RecoveryRecovery
VitaminsVitamins
Natural E/Organic Se is a pelleted supplement providing organic Selenium yeast and natural Vitamin E. These two nutrients are important antioxidants that support muscle function and anti-inflammatory pathways.
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.
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