Calcium, magnesium and vitamin-D are the macro nutrients for bone. Calcium is used as a pharmacological agent in humans almost entirely to remedy deficiency. Adequate calcium in the blood is so vital to a wide variety of bodily functions that our internal biochemistry will not tolerate a deficiency even for short periods. Clinical evidence suggests that calcium is useful for the prevention and treatment of osteoporosis and associated fractures. Vitamin-D is also essential for healthy bones as it aids in calcium absorption from the GI tract. In addition to this it stimulates bone formation. Clinical studies show that calcium and vitamin-D has synergistic effects on bone growth as well as in osteoporosis and fracture prevention. Magnesium also increases bone strength and rigidity. Some micro nutrients like copper, manganese, zinc and boron also play important role in bone health.