It aids in the absorption and utilization of calcium and phosphorus. They are two minerals essential for healthy development of bones and teeth. Vitamin D is valuable for maintaining normal blood clotting, a stable nervous system, normal heart function, and proper functioning of muscles, blood clotting, cell growth, and energy utilization. In adults, deficiencies are characterized by osteomalacia which is softening of bones, causing deformity and fractures. Other signs of deficiency are inadequate absorption of calcium from intestinal tract and retention of phosphorus in the kidney's leading to faulty mineralization of bone structures.
Tetany is a condition characterized by muscular numbness, tingling, spasms, and myopia.
Anorexia, constipation, diarrhea, dry mouth, headache, increased thirst, mental confusion, metallic taste, nausea, unusual tiredness, vomiting. Vitamin D may reduce the effect of calcitonin. When combined with digitalis, Vitamin D can increase the risk or arrhythmias. With phosphorus containing medicines, Vitamin D can increase serum levels of phosphorus.