Formulated to provide a source of calcium, phosphorus and magnesium, combined with Vitamins A, C and D, essential trace-minerals and glucosamine to assist the uptake, regulation and balance of these vital bone and joint cartilage structural components. An adequate intake of calcium, phosphorus and magnesium is required for bone development, maintenance of skeletal strength and the 'bone bank' of stored calcium, as well as optimum muscle function and to meet increased demands during late pregnancy and lactation in mares.