For the doctors' arrival at home, the order amount must be more than 50 AZN. Vitamin D (25-OH-D3). Vitamin D deficiency is manifested by rickets in children and osteomalacia in adults. Too much vitamin D can be toxic. The main role of vitamin D is associated with the regulation of calcium metabolism. Recent studies have shown that normal levels of vitamin D in the body reduce the risk of a number of cancers, diabetes, multiple sclerosis, cardiovascular disease, and tuberculosis.