TuffRock EJF Equine Joint Formula - is a powerful all-in-one natural feedstuff for horses made from the world's first energised volcanic minerals with available collagen that supports synovial joint fluid, cartilage structure, bone density plus ligaments and tendons. The world's first joint, coat, hooves and digestive treat the looks like bread crumbs, smells like salt and vinegar chips and horses of all ages really love the taste.