Vitamin C is a powerful antioxidant that can help protect the horse’s cells from damage caused by free radicals. It is also important for the production of collagen, a protein that is essential for the health of connective tissue, including skin, cartilage, and bones. As such, vitamin C is often used as a supplement to support joint health in horses. In addition to its antioxidant and joint health benefits, vitamin C is also believed to have immune-boosting properties in horses. It is thought to help support the horse’s immune system, helping to ward off infections and other diseases.