Did you know Vitamin C is not an essential nutrient in your horse’s diet? Unlike we humans, who will get scurvy and die if we don’t eat vitamin C, horses make their own vitamin C in their liver! Clever right!!
There are some situations, like when a horse is very ill, really stressed or has liver damage where supplementing with vitamin C may be useful. Just be mindful that when you want to stop supplementing you should remove the vitamin C from the diet gradually so the horse has a chance to ramp its own production up again.