The Missing Link 5-Pound Equine Plus Formula with Joint Support for Horses Glucosamine to support healthy joints and flexibility. Omega fatty acids help the absorption of fat soluble vitamins which nutritionally support: intercellular health, energy levels, the immune system, and muscle, tendon and ligament function. Nutrients work together to grow strong, tough hooves. Dietary fiber to promote a healthy digestive system Phyto (plant) nutrients to support general health and nutrition.