O-Kal D is Effervescent Tablet which acts as a supplement for strength and maintenance of healthy bones. It acts as a ready source of Calcium and Vitamin D3 for the consumer. Elemental Calcium is available in the form of soluble Calcium citrate which is readily absorbed in body and prevents low body Calcium levels. It may be helpful in conditions marked by low Calcium levels such as bone loss (osteoporosis), weak bones (osteomalacia/rickets), decreased activity of the parathyroid gland (hypo-parathyroidism) etc. It can be useful as a daily Calcium source for pregnant and lactating women, postmenopausal women, elderly people who generally have low bone Calcium levels.