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Ascorbic Acid (Vitamin C Supplement)

Ascorbic acid, commonly known as vitamin C, is a water-soluble vitamin that plays a crucial role in antioxidant defense, collagen synthesis, and immune function. Unlike humans, horses can produce vitamin C in their liver from glucose, reducing their dependence on dietary sources.

However, in certain situations—such as high stress, illness, aging, or intense exercise—horses may benefit from supplemental ascorbic acid to support immune function and tissue repair. Because ascorbic acid is sensitive to heat, light, and oxidation, stabilized forms, such as L-ascorbyl-2-polyphosphate, are often used in feed to ensure potency.

The following equine feeds, supplements and products contain Ascorbic Acid (Vitamin C Supplement) as an ingredient.

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Feeds, Supplements & Products
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.
Performance XL: Electrolytes (Mad Barn)
Competition HorsesCompetition Horses
ElectrolyteElectrolyte
PerformancePerformance
StaminaStamina
Performance XL: Electrolytes by Mad Barn is a scientifically formulated equine electrolyte supplement designed to support athletic performance and workout recovery. It contains an ideal blend of natural minerals and vitamins to promote hydration status and muscle function.
Myo-Guard (Kentucky Performance Products)
AntioxidantAntioxidant
MuscleMuscle
PerformancePerformance
VitaminsVitamins
Myo-Guard from Kentucky Performance Products aims to provide muscle support and strength by providing antioxidants.
Natural Digestive Support – BioEquine Supplement
DigestionDigestion
Mineral BalanceMineral Balance
ProbioticProbiotic
Toxin BinderToxin Binder
BioEquine Natural Digestive Support is an equine gut health supplement containing probiotics, toxin binders, Diatomaceous Earth, minerals, vitamins and amino acids.
Naturals Pelleted Horse Feed (Triple Crown)
Complete FeedComplete Feed
EnergyEnergy
NutritionNutrition
ProteinProtein
Triple Crown Naturals is a pelleted horse feed made with GMO-free ingredients and without corn, soybean, or molasses. Energy sources include alfalfa meal, ground oats, wheat middlings, and flaxseed.
Next Level Joint (liquid) (Farnam)
GrowthGrowth
JointsJoints
PerformancePerformance
SeniorSenior
Next Level Joint by Farnam is liquid supplement that contains glucosamine, chondroitin, perna mussel and MSM. The recommended feeding rate is 1 - 2 oz per day.
Next Level Joint (pellet) (Farnam)
ExerciseExercise
GrowthGrowth
JointsJoints
SeniorSenior
Next Level Joint by Farnam is pelleted supplement that contains glucosamine, chondroitin, perna mussel and MSM. The recommended feeding rate is 1 oz (30 grams) per day.
Next Level Performance (Farnam)
JointsJoints
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Farnam Next Level Performance is a pelleted supplement intended to support joints, connective tissue and exercise recovery. It contains microlactin, glucosamine, chondroitin, Vitamin C and minerals.
Nutrimix Plus (Stride Animal Health) – [Discontinued]
Coat QualityCoat Quality
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
Nutrimix Plus from Stride Animal Health is a vitamin and mineral supplement that can support healthy hooves. It can also contribute to hair and coat quality.
Oat Base (No Corn) (Ace Hi Feeds)
Caloric EnergyCaloric Energy
FlavorFlavor
GrainsGrains
NutrientsNutrients
Oat Base by Ace Hi Feeds is a corn-free, textured equine feed. It contains added vitamins and a blend of organic and inorganic minerals. This textured feed is intended for all horses and ponies.
OCD Pellets (Doc’s Products)
Bone HealthBone Health
GrowthGrowth
HealthHealth
JointsJoints
OCD Pellets by Doc's Products is a bone and joint supplement intended for horses. It supplies 900 mg of silicon and 50 mg of hyaluronic acid in each 28 g serving.
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.
Omega Elite (Horslic)
ElectrolyteElectrolyte
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Omega Elite by Horslic is a pasture tub intended for free-choice intake. It is available with feed-through fly control in the U.S.
Omega Match Ahiflower Oil (Purina)
Coat QualityCoat Quality
FatFat
JointsJoints
Omega 3-6-9Omega 3-6-9
Purina Omega Match Ahiflower Oil is a fat supplement that is a source of omega-3 and omega-6 fatty acids. Ahiflower is a wildflower cultivated for its oilseed. Research suggests it is more readily converted into anti-inflammatory eicosapentaenoic acid (EPA) than flaxseed oil.
Omega+ (Bluebonnet)
Coat QualityCoat Quality
FatFat
JointsJoints
Omega 3-6-9Omega 3-6-9
Omega+ by Bluebonnet is a granular omega-3 supplement formulated to support skin and coat health, reproductive function, and immune strength. It provides a balanced blend of EPA, DHA, and ALA.
OMG (Dove Performance Nutrition)
Mineral BalanceMineral Balance
NutrientsNutrients
Ration BalancerRation Balancer
VitaminsVitamins
OMG from Dove Performance Nutrition is a pelleted feed ration for horses. It contains vitamins, minerals, protein, fiber and fat.
Omolene Maternity 300 (Purina Canada)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Purina Omolene Maternity 300 is a textured horse feed intended for broodmares, nursing and growing foals. It provides higher amino acid content to support growth and development.
Omolene Progression 200 (Purina)
BroodmareBroodmare
Complete FeedComplete Feed
NutritionNutrition
PerformancePerformance
Omolene Progression 200 is a textured feed intended for performance horses, growing horses and gestating mares. It supplies 14% protein, 7% fat and 10% fiber.
Omolene Senior Action (Purina)
ExerciseExercise
PerformancePerformance
Ration BalancerRation Balancer
SeniorSenior
Omolene Senior Action is a complete textured feed formulated for active senior horses. It provides 14% protein, which may support muscle tone in senior horses that are not receiving enough protein from their forage.
Omolene Sport Plus (Purina)
Complete FeedComplete Feed
Competition HorsesCompetition Horses
ExerciseExercise
PerformancePerformance
Purina Omolene Sport Plus is a textured complete feed intended for horses in heavy work including racehorses. It provides 8% fat from vegetable oils and contains beet pulp as a high pectin fibre source.
On Demand (Equine Challenge)
AntioxidantAntioxidant
JointsJoints
NutrientsNutrients
RecoveryRecovery
On Demand by Equine Challenge is a powdered supplement intended to support overall health of tendons, joints and ligaments in all classes of horses.
On Demand (No Glucosamine + HA) (Equine Challenge)
AntioxidantAntioxidant
Bone HealthBone Health
JointsJoints
RecoveryRecovery
On Demand (No Glucosamine + HA) by Equine Challenge is a powdered supplement intended to support overall health of tendons, joints and ligaments in all classes of horses. It contains no added glucosamine or hyaluronic acid.
Opti-Ferm Horse Tub (ClariFly) (Kalmbach Feeds)
HealthHealth
NutrientsNutrients
NutritionNutrition
Skin + HairSkin + Hair
Opti-Ferm Horse Tub with Clarifly by Kalmbach Feeds is an energy, vitamin and mineral supplement lick. It contains diflubenzuron, which reduces the emergence of flies from manure.
Opti-Ferm Horse Tubs (Kalmbach Feeds)
Caloric EnergyCaloric Energy
FlavorFlavor
Mineral BalanceMineral Balance
NutritionNutrition
Opti-Ferm Horse Tub by Kalmbach Feeds is an energy, vitamin, and mineral supplement lick. It contains added molasses and fat for palatability and 10 mg/lb of added biotin for hoof health.
Optimize (Uckele)
FiberFiber
Low NSC FeedsLow NSC Feeds
MetabolismMetabolism
NutrientsNutrients
Optimize is a pelleted ration balancer with a feeding rate of 1-2 lbs per day. It is formulated for horses needing a low starch and sugar diet, such as horses with metabolic disorders. The NSC content in this ration balancer is 7.8%
Optimum (Strictly Equine)
HealthHealth
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Optimum by Strictly Equine is a vitamin and mineral supplement intended to fill nutritional gaps for all types of horses.
Optimum Flex Plus (DAC)
HealthHealth
JointsJoints
RecoveryRecovery
VitaminsVitamins
Optimum Flex Plus by DAC is a powdered joint supplement designed to support joint health and mobility. Its formula includes MSM, glucosamine, and chondroitin sulfate.
Orange Superior (DAC)
MetabolismMetabolism
Mineral BalanceMineral Balance
ProbioticProbiotic
VitaminsVitamins
Orange Superior is a vitamin and mineral supplement that can be given to any mature horse, and is meant to support metabolic functions, energy balance, and also provides probiotics.
Original Multi Balancer (Spillers Feeds)
Gut HealthGut Health
Hoof HealthHoof Health
ImmunityImmunity
Ration BalancerRation Balancer
VitaminsVitamins
The Original Multi Balancer from Spillers Feed is cereal grain-free, low in sugars, and low in starches. This feed is high in Vitamins and minerals such as Vitamin A, Vitamin D3, Vitamin E, Copper, and Zinc.
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.
Oxy + Equine Enhanced (Bonina)
Mineral BalanceMineral Balance
MuscleMuscle
RespiratoryRespiratory
VitaminsVitamins
Oxy + Equine Enhanced by Bonina is a vitamin and mineral supplement intended to support muscle growth and respiratory health in all classes of horses.
Paradox Organic Selenium Supplement (Probiotech)
AntioxidantAntioxidant
Mineral BalanceMineral Balance
Organic Trace MineralsOrganic Trace Minerals
VitaminsVitamins
Paradox by Probiotech is a granular organic selenium-enriched yeast supplement with added Vitamin E and Vitamin C. It also contains mannan oligosaccharides (MOS) and yucca schidigera.
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.
Pasture Cubes (Dodson & Horrell)
Complete FeedComplete Feed
GrainsGrains
HerbHerb
NutritionNutrition
Pasture Cubes by Dodson & Horrell is a feed that is lower in protein and has an elevated fibre level. This feed is for horses and ponies that need some additional fibre and vitamins, and minerals in their diet.
PEDIcare (Herbs for Horses)
AntioxidantAntioxidant
HerbHerb
Hoof HealthHoof Health
JointsJoints
PEDIcare is a pelleted joint supplement for horses formulated with glucosamine, chondroitin, MSM, vitamin E and C, and an antioxidant blend. This feed is ideal for all horses and ponies but in specific horses on turnout where powdered supplements may be lost.
Pelleted Hoof Supplement (American Farrier’s Association)
FlavorFlavor
Hoof HealthHoof Health
Mineral BalanceMineral Balance
VitaminsVitamins
This pelleted hoof supplement is meant to be palatable and functional for any horse or pony. It contains a variety of minerals and vitamins which aims to support strong, healthy hooves.
Pennwoods 13 to 36 Advanced (Pennwoods Equine)
FatFat
FoalFoal
GrowthGrowth
ProteinProtein
Pennwods 13 to 36 Advanced is a growth and performance supplement targeted to yearling and two-year-old horses. It contains a blend of proteins, fats, vitamins, and minerals.
Perfectly Senior Horse Summer Pellet (Kruse’s Perfection Brand)
FiberFiber
GrainsGrains
JointsJoints
SeniorSenior
Perfectly Senior Horse Summer Pellet by Kruse's Perfection Brand is a pelleted feed that is intended to be fed to senior maintenance, performance, and breeding horses. This feed is meant to be fed as a complete feed or supplemented with hay or pasture equivalent.
Perfectly Senior Horse Winter Pellet (Kruse’s Perfection Brand)
BroodmareBroodmare
Complete FeedComplete Feed
PerformancePerformance
SeniorSenior
Perfectly Senior Horse Winter Pellet by Kruse's Perfection Brand is a feed that intends to be fed to senior maintenance, performance, and breeding horses either as a complete feed or supplemented with hay or pasture equivalent.
Perfo EXT (Sollio Agriculture)
Competition HorsesCompetition Horses
HealthHealth
NutritionNutrition
Weight IssuesWeight Issues
Perfo EXT is a high-calorie extruded feed. This feed is intended for performance horses or horses who require additional calories.
Perfomix (Cavalor)
Complete FeedComplete Feed
Mineral BalanceMineral Balance
ProteinProtein
VitaminsVitamins
Cavalor Perfomix is a complete textured feed intended for active recreational and competition horses. It provides 11.5% protein and 4% fat from ingredients such as oats, wheat middlings, barley and soy hulls.
Perform Gold (Triple Crown)
Caloric EnergyCaloric Energy
Competition HorsesCompetition Horses
FatFat
FiberFiber
Perform Gold is a high energy density pelleted feed designed for performance horses. It provides 12.5% protein, 12% fat and 15.3% NSC, and contains a mixture of organic and inorganic minerals.
Performance & Recovery Pellets (Equine America)
AntioxidantAntioxidant
JointsJoints
MuscleMuscle
RecoveryRecovery
Performance and Recovery Pellets from Equine America is a supplement intended to assist with joint and muscle health and recovery. It is meant to reduce inflammation associated with training and contains antioxidants.
Performance Advantage (Tribute Equine)
EnergyEnergy
FatFat
FoalFoal
PerformancePerformance
Tribute Performance Advantage® is a grain-based, textured feed formulated to meet the higher energy requirements of performance horses. It provides 8% fat and 31% NSC.
Performance Balancer (Dodson & Horrell)
Hoof HealthHoof Health
JointsJoints
PerformancePerformance
Ration BalancerRation Balancer
Performance Balancer is a performance feed meant to be fed as a low intake feed or alongside another feed. This feed provides the vitamins and minerals to support joint care, a higher level of biotin for hoof support, and yeast for a healthy hindgut.
Performance Builder (Finish Line)
Amino AcidAmino Acid
PerformancePerformance
ProteinProtein
RecoveryRecovery
Performance Builder by Finish Line is liquid additive designed for muscle growth and overall health. It contains amino acids and is designed for all ages of horses.
Performance Equine Mineral and Vitamin Formulation (Wild Gold)
ElectrolyteElectrolyte
Mineral BalanceMineral Balance
ProbioticProbiotic
VitaminsVitamins
Performance Equine Mineral and Vitamin Formulation by Wild Gold is a premixed supplement that is intended to provide vitamins, minerals, and probiotics to support optimal nutrient absorption.
Performance Liquid (Formula 707)
Mineral BalanceMineral Balance
NutrientsNutrients
PerformancePerformance
VitaminsVitamins
Performance Liquid from Formula 707 is a liquid supplement containing vitamins and minerals. It is intended to provide energy and nutrients for performance horses.
Performance One (Pureform)
Competition HorsesCompetition Horses
ElectrolyteElectrolyte
ExerciseExercise
PerformancePerformance
Performance One is a concentrated supplement for performance horses providing glucosamine, MSM, creatine, amino acids, vitamins, trace minerals and electrolytes.
Performance Pelleted (Woody’s Horse Nutrition)
Competition HorsesCompetition Horses
FatFat
PerformancePerformance
ProteinProtein
Woody’s Performance Pelleted is a complete pelleted feed with higher energy density for working horses. It is formulated with beet pulp, alfalfa meal and oats, and contains 14% protein and 8% fat.
Performance Plus 606 Pellets (Ace Hi Feeds)
Caloric EnergyCaloric Energy
NutritionNutrition
PerformancePerformance
ProteinProtein
Performance Plus 606 by Ace Hi Feeds is intended for horses with higher energy needs including growing and performance horses. It contains barley, wheat bran, and canola oil as energy sources.
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.

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