Vitamin C is involved in the transfer of iron and is vital to the normal formation of collagen, an essential structure of skin and connective tissue including tendons and ligaments. Vitamin C also supports the immune system.
Healthy horses synthesise their own Vitamin C and this, along with Vitamin C gained through green leafy forage, is normally considered sufficient. However, horses in hard work with little access to fresh green forage or recovering from illness or injury may benefit from additional Vitamin C.