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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.
Low Starch (Triple Crown)
Complete FeedComplete Feed
Grain FreeGrain Free
Metabolic SyndromeMetabolic Syndrome
SeniorSenior
Triple Crown Low Starch is a pelleted feed containing a lower level of 13.5% NSC. It has no whole grains, molasses or alfalfa meal which can cause excitability in horses.
Low Starch Omega Plus (Equine Advantage)
Caloric EnergyCaloric Energy
FatFat
FiberFiber
NutritionNutrition
Low Starch Omega Plus is intended for horses that need moderate to significant calories added to their diet. This diet is suitable for horses with Insulin Resistance, Cushing's Disease, and PSSM due to the low NCS.
Lung+ (Advanced Equine Nutrition)
Gut HealthGut Health
HealthHealth
ImmunityImmunity
RespiratoryRespiratory
Lung+ by Advanced Equine Nutrition is intended to support allergies and respiratory function. It contains spirulina and jiaogulan.
Magnify (Dove Performance Nutrition)
FatFat
Mineral BalanceMineral Balance
NutritionNutrition
VitaminsVitamins
Magnify from Dove Performance Nutrition is a pelleted ration that contains minerals, vitamins, and higher levels of fat. It is made for any class of horse.
Magnify HF – High Fat (D&D Nutrition)
FatFat
ForageForage
NutritionNutrition
Omega 3-6-9Omega 3-6-9
Magnify HF - High Fat by D&D Nutrition is a pelleted feed with an elevated level of fat, fibre, and protein intended for horses of all life stages. It contains energy sources such as alfalfa, rice bran, and coconut meal.
Majesty’s Flex HA Wafers (Majesty’s Animal Nutrition)
GrowthGrowth
JointsJoints
PerformancePerformance
SeniorSenior
Majesty's Flex HA Wafers are meant to support joint health in horses. It contains glucosamine, MSM, chondroitin sulfate, yucca extract, ascorbic acid, and sodium hyaluronate.
Makor (St.Hippolyt)
CalmingCalming
PerformancePerformance
RecoveryRecovery
StressStress
Makor by St.Hippolyt is a supplement high in magnesium and Vitamin E intended to support horses in intense competition and training.
Manna Senior Pellets (Manna Pro)
DigestionDigestion
Hoof HealthHoof Health
MuscleMuscle
SeniorSenior
Manna Senior Pellets by Manna Pro is a pelleted horse feed intended to support hoof health, digestion, muscle and healthy weight in senior horses.
Mare & Foal (Ace Hi Feeds)
BroodmareBroodmare
FoalFoal
GrowthGrowth
NutritionNutrition
Mare & Foal by Ace Hi Feeds is a supplemental feed intended for growing, gestating and lactating horses. It contains at least 16% protein from sources such as soybean meal, whey, and dried distillers grains.
Mare & Foal (Kelley’s Feed)
BroodmareBroodmare
FoalFoal
GrowthGrowth
NutritionNutrition
Mare & Foal by Kelley's Feed is a supplemental feed intended for growing, gestating, and lactating horses. It is a barley-based feed that contains at least 16% protein, added vitamins, and a blend of organic and inorganic minerals.
Mare & Foal (Running Horse Elite Equine Nutrition)
BroodmareBroodmare
FoalFoal
GrowthGrowth
LactationLactation
Running Horse Elite Mare & Foal is a high-fat feed that contains 16% protein and 9% fat from sources such as wheat middlings, rice bran, and soybean oil. This feed is targeted at pregnant, lactating, and growing horses.
Mare’s Milk Plus (Buckeye)
EnergyEnergy
FoalFoal
NutritionNutrition
ProteinProtein
Mares Milk Plus is a powdered milk replacer for nursing, orphaned or rejected foals. It contains digestible, whey-based proteins to minimize digestive upset and is fully fortified.
MareKare (AniMed)
BroodmareBroodmare
LactationLactation
NutrientsNutrients
VitaminsVitamins
MareKare from AniMed is a made for pregnant and lactating mares. This vitamin and mineral supplement is meant to provide extra nutrients and help maintain body condition during breeding, foaling, and lactating.
Materna (Sollio Agriculture)
GrowthGrowth
HealthHealth
MareMare
NutritionNutrition
Materna is a pelleted feed intended for broodmares during lactation and gestation. This feed is intended to promote the development of the fetus. Materna contains 16% crude protein.
Mature Horse (Bar Ale)
Complete FeedComplete Feed
JointsJoints
NutritionNutrition
SeniorSenior
Mature Horse is intended to support overall health and nutrient requirements for an adult to a senior horse. It contains glucosamine which is meant to support joint health.
Maverick 12-8 Horse Pellet (Big V Feeds)
BroodmareBroodmare
HealthHealth
NutritionNutrition
PerformancePerformance
Maverick 12-8 Horse Pellet by Big V Feeds is a pelleted feed intended for breeding stock, maintenance and performance horses.
Maverick 14-6 Horse Pellet (Big V Feeds)
Complete FeedComplete Feed
HealthHealth
NutrientsNutrients
NutritionNutrition
Maverick 14-6 Horse Pellet by Big V Feeds is a pelleted feed intended for all classes of horses.
Maverick 14% Dry Mix (Big V Feeds)
Complete FeedComplete Feed
HealthHealth
NutrientsNutrients
NutritionNutrition
Maverick 14% Dry Mix by Big V Feeds is a textured feed formulated with 14% protein and is intended for all classes of horses.
Maverick 14% VRX (Big V Feeds)
BroodmareBroodmare
NutritionNutrition
PerformancePerformance
StallionStallion
Maverick 14% VRX by Big V Feeds is a textured feed intended for yearlings, mares, stallions, mature pleasure and performance horses.
Maverick Senior Horse Pellets (Big V Feeds)
Complete FeedComplete Feed
NutrientsNutrients
NutritionNutrition
SeniorSenior
Maverick Senior Horse Pellets by Big V Feeds is a pelleted feed formulated for senior horses.
Maximum E & SE (Cox Vet Lab)
AntioxidantAntioxidant
ImmunityImmunity
MuscleMuscle
VitaminsVitamins
Maximum E & SE is a liquid supplement intended to support healthy muscle, nerve, and reproduction functions. It is ideal for performance and working horses.
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.
Mighty-Lyte (Equi-lete)
ElectrolyteElectrolyte
HydrationHydration
Mineral BalanceMineral Balance
VitaminsVitamins
Mighty-Lyte by Equi-lete is an electrolyte supplement that is intended to support hydration and provide vitamins and minerals. It is meant for horses in hot weather.
Mighty-Lyte Paste (Equi-lete)
ElectrolyteElectrolyte
HydrationHydration
Mineral BalanceMineral Balance
VitaminsVitamins
Mighty-Lyte Paste from Equi-lete is an electrolyte paste that is meant to support hydration and replace electrolytes. It contains vitamins and minerals.
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.
Mind, Body & Sole – Alfalfa (Equine Challenge)
DigestionDigestion
Omega 3-6-9Omega 3-6-9
Ration BalancerRation Balancer
Skin + HairSkin + Hair
Mind, Body & Sole - Alfalfa by Equine Challenge is a ration balancer intended to support overall health in horses on alfalfa diets.
Mind, Body & Sole – GRASS (Equine Challenge)
DigestionDigestion
Omega 3-6-9Omega 3-6-9
Ration BalancerRation Balancer
Skin + HairSkin + Hair
Mind, Body & Sole - GRASS by Equine Challenge is a ration balancer intended to support overall health in horses on grass diets.
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.
MoviCur (St.Hippolyt)
HealthHealth
JointsJoints
PerformancePerformance
RecoveryRecovery
MoviCur by St.Hippolyt is a supplement intended to support the overall health of tendons, ligaments and joints in horses.
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®.
Mucolyte (St.Hippolyt)
HealthHealth
ImmunityImmunity
NutritionNutrition
RespiratoryRespiratory
Mucolyte by St.Hippolyt is a supplement intended to support horse's airways and overall immune function.
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 Builder Plus (Formula 707)
Hoof HealthHoof Health
Mineral BalanceMineral Balance
MuscleMuscle
VitaminsVitamins
Muscle Builder Plus from Formula 707 is a pelleted supplement intended to support hoof support, muscle growth, and contains vitamins and minerals.
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.

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