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Can horses make their own Vitamin C?

16th September 2025
Beryl Shuttleworth
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can horses make their own vitamin c

Horses are actually able to make their own vitamin C in their liver, unlike humans, who must obtain it from their diet. This means healthy horses typically don’t require vitamin C supplementation under normal circumstances. Their bodies naturally produce what they need.

But (and this is an important but), there are situations where vitamin C requirements might increase or production might be compromised:

When horses might need more vitamin C:

  • During periods of stress, illness, or injury
  • Heavy training or competition
  • Poor quality forage or limited pasture access
  • Older horses whose synthesis capacity may decline
  • Horses with certain health conditions
  • In South Africa, during AHS seasn

Fresh pasture grass contains vitamin C, though the amount varies by season and grass type. Hay loses most of its vitamin C content during the drying process. Many commercial feeds now include added vitamin C, and fresh fruits and vegetables (when fed as treats) can contribute small amounts.

Vitamin C is a truly amazing vitamin and it directly stimulates the immune system. In my opinion, we’d be missing a great opportunity to boost immunity if we didn’t supplement vitamin C at times of need.

This is why we use Vitamin C in our Immune mix. #whyweuseitwednesday

#HorseHealth #EquineNutrition #VitaminC

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