One-Alpha 0.5 mcg – Vitamin D & Bone Strength CapsuleOne Alpha Capsules 0. 5 mcg Alfacalcidol Vitamin D Analogue for Osteoporosis & Bone Health One Alpha Capsules 0. 5 mcg contain Alfacalcidol, a vitamin D analogue that helps regulate calcium and phosphate metabolism in the body. By increasing vitamin D levels, it enhances the absorption of calcium and phosphate from the intestines, leading to improved bone strength and mineralization. This medicine is used to treat osteoporosis, osteomalacia, rickets,