Adequate intake of calcium and vitamin D supplements is essential for stronger bones. Calcium is capable of combining with other minerals. This combination produces hard crystals that improve bone structure and strength. Vitamin D in the body helps to absorb calcium and hence maintains its level. In addition, it supports the skeletal growth. Sunlight is the main source of vitamin D. The recommended supplements for both calcium and vitamin D are milk, cheese, yoghurt, egg, and oily fish.