Calcium : The body stores calcium in the bones and teeth to help them strong. The exact amount of calcium you need depends on your age and other factors. Growing children and teenagers need more calcium than young adults. Older women need plenty of calcium to prevent osteoporosis. People who do not eat enough high-calcium foods should take a calcium supplement ( NIH National Institutes of Health)
Vitamin D : compounds include ergocalciferol (D2), cholecalciferol (D3) and fat-soluble sterols sometimes considered to be hormones for hormone precusors, which are essential for the proper regulation of calcium and phosphate homoeostasis and bone mineralization. (7888-E) P1390 31st edition Martindale.