Vitamin C for Horses: Benefits, Deficiencies, and Supplementation

When it comes to equine health, Vitamin C often flies under the radar. Unlike humans, horses naturally produce their own Vitamin C. So, is supplementation really necessary? The answer depends on the individual horse's lifestyle, stress level, age, and health condition.

In this post, we'll explore the role of Vitamin C in horses, signs of deficiency, benefits of supplementation, and how to choose the right product.

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What Is Vitamin C and Why Do Horses Need It?

Vitamin C (ascorbic acid) is a powerful antioxidant. It helps neutralize harmful free radicals in the body, supports immune function, aids in collagen synthesis (important for healthy skin, tendons, and ligaments), and enhances the absorption of other nutrients like iron.

While horses produce Vitamin C in their liver from glucose, certain stressors can impair this natural production or increase their need for it.

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When Do Horses Need Extra Vitamin C?

Healthy horses in low-stress environments usually produce enough Vitamin C. However, supplementation may be beneficial in the following scenarios:

Aging horses: Liver efficiency declines with age, reducing Vitamin C production.

Horses under stress: Transportation, illness, surgery, or intense training can increase oxidative stress.

Chronic illness: Horses with allergies, respiratory issues (like heaves), or compromised immune systems may benefit.

Poor wound healing: Vitamin C supports collagen formation and tissue repair.

Heavy exercise: Performance horses experience higher oxidative stress and may need antioxidant support.

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Signs of Vitamin C Deficiency in Horses

Although true Vitamin C deficiency is rare in horses, subclinical deficiencies can manifest subtly. Look for:

Slower wound healing

Frequent infections or poor immune response

Allergies or skin irritations

Lethargy or poor recovery after exercise

If you suspect a deficiency, consult with your veterinarian before supplementing.

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Benefits of Vitamin C Supplementation for Horses

1. Boosts Immune Health – Helps horses recover from illness faster and reduces the risk of infection.

2. Supports Respiratory Function – Especially helpful for horses with allergies or respiratory conditions.

3. Promotes Healthy Skin and Joints – Essential for collagen production, benefiting connective tissues.

4. Reduces Inflammation – Acts as an antioxidant to fight free radical damage.

5. Speeds Recovery After Stress or Surgery – Useful for horses undergoing travel, competition, or medical treatment.

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How to Supplement Vitamin C for Horses

If your horse falls into a high-risk category, a Vitamin C supplement may be helpful. Here's what to consider:

Form: Available as ascorbic acid powder, tablets, or combined with other antioxidants like Vitamin E and selenium.

Dosage: Always follow veterinary guidance. Too much Vitamin C may disrupt natural production or lead to imbalances.

Quality: Choose reputable equine supplement brands with third-party testing for purity.

⛔ Important Note: Over-supplementing antioxidants can do more harm than good. Always consult your vet before introducing any new supplement.

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