FROCAL D3 NANO contains Vitamin D3 (Cholecalciferol). It is a steroid hormone produced in the skin when exposed to ultraviolet light or obtained from food sources. It is a provitamin that is converted into a vitamin after intake.  It helps maintain blood calcium and phosphorus levels and the mineralization of bone. FROCAL D3 NANO is also used in the treatment of familial hypophosphatemia (a group of rare inherited disorders characterized by impaired kidney conservation of phosphate and in some cases, altered vitamin D metabolism).