Raditrol 0.25 mcg is a calcitriol-based vitamin D3 supplement manufactured by Radiant Pharmaceuticals Ltd. Calcitriol is the active form of vitamin D3, produced in the kidneys from its precursor, 25-hydroxycholecalciferol. It plays a crucial role in calcium and phosphate metabolism by promoting intestinal absorption of calcium and regulating bone mineralization. Raditrol is indicated for conditions such as post-menopausal osteoporosis, renal osteodystrophy, postsurgical hypoparathyroidism, idiopathic hypoparathyroidism, pseudohypoparathyroidism, secondary hyperparathyroidism in patients with moderate to severe chronic renal failure (pre-dialysis), and vitamin D-dependent rickets