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Ascorbic Acid (Vitamin C Supplement) - Feed Ingredient

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.

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.
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.
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.
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-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-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.
Melange C 10% (Nature Belisle)
AntioxidantAntioxidant
HealthHealth
IngredientIngredient
VitaminsVitamins
Melange C 10% by Nature Belisle is a vitamin C supplement. It is intended for horses and ponies of all ages and work levels. It can be beneficial during heat waves as a de-stressor.
Meta-Librium (Equi-Force)
CalmingCalming
Metabolic SyndromeMetabolic Syndrome
Mineral BalanceMineral Balance
VitaminsVitamins
Meta-Librium is a supplement intended to help manage metabolic syndrome and insulin resistance in horses and ponies. It contains magnesium, lipoic acid, vitamin E and C, and L-Carnitine, enhancing insulin action.
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.
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.
Min-A-Vite (Blue Seal) [DISCONTINUED]
HealthHealth
Mineral BalanceMineral Balance
NutrientsNutrients
VitaminsVitamins
Min-A-Vite from Blue Seal is a vitamin and mineral supplement intended for horses and ponies of all ages and work levels. Min-A-Vite uses a mix of inorganic and organic trace minerals.
MinerEQ (Omega Alpha)
Hoof HealthHoof Health
Mineral BalanceMineral Balance
MuscleMuscle
VitaminsVitamins
MinerEQ by Omega Alpha is a powdered vitamin and mineral supplement for horses that provides essential minerals, trace elements, vitamins, and antioxidants to maintain good health.
MSM Plus (Herbs for Horses)
AntioxidantAntioxidant
JointsJoints
NutrientsNutrients
VitaminsVitamins
MSM Plus by Herbs for Horses is a pelleted supplement that contains glucosamine, vitamin C, vitamin E, and yucca extract, which intends to support healthy joint function. It has no fillers and is compliant with FEI rules.
MSM Plus Joint Supplement (Herbs for Horses)
AntioxidantAntioxidant
Competition HorsesCompetition Horses
JointsJoints
SeniorSenior
Herbs for Horses MSM Plus is a joint supplement containing methylsulfonylmethane (MSM), glucosamine, vitamin C, natural vitamin E, yucca extract, zinc, copper, and manganese.
MSM+Ester-C Pellets (MVP)
AntioxidantAntioxidant
IngredientIngredient
JointsJoints
VitaminsVitamins
MSM+Ester-C Pellets by MVP is a supplement for horses that intends to support connective tissue and ease discomfort. It contains ingredients such as MSM and Ester-C®.
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-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.
Multiflex (Multivet USA Inc)
HealthHealth
JointsJoints
NutrientsNutrients
NutritionNutrition
Multiflex is an equine joint supplement providing glucosamine, chondroitin, MSM, hyaluronic acid, vitamin C and trace minerals involved in maintaining connective tissue. It provides 3750mg of Glucosamine Sulfate per serving.
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
Munga (Hygain)
Easy KeeperEasy Keeper
HealthHealth
Low NSC FeedsLow NSC Feeds
NutritionNutrition
Munga from Hygain is a textured feed intended for horses in light to medium work levels. Munga contains 13% NSC, 25% crude protein and 11% crude fat.
Munga (Mitavite)
Bone HealthBone Health
Grain FreeGrain Free
Gut HealthGut Health
PerformancePerformance
Munga by Mitavite is a grain-free, low starch muesli intended to meet the nutritional needs of performance horses.
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-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.
MVP Matrix 5+ H/A Pellets (MVP)
AntioxidantAntioxidant
JointsJoints
RecoveryRecovery
SeniorSenior
MVP Matrix 5+ H/A Pellets by MVP is a supplement for horses that intends to help support joint function. It is palatable with apple flavouring and contains glucosamine, hyaluronic acid, chondroitin sulphate, and MSM.
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
HealthHealth
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 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
HealthHealth
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
PerformancePerformance
StallionStallion
Omolene Progression 200 is a textured feed intended for performance horses, growing horses and gestating mares. It supplies 14% protein and 7% fat from ingredient sources including soybean meal, soybean oil, whole oats, flaked barley and extruded corn.
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.
Opti-Ferm Horse Tub (ClariFly) (Kalmbach Feeds)
Caloric EnergyCaloric Energy
HealthHealth
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 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.
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.
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.

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