Hidroferol 0.266 mg Capsules 10’sHidroferol 0. 266 mg Capsules contain calcifediol, an active form of vitamin D? used to treat and prevent vitamin D deficiency and related bone disorders. Vitamin D plays a key role in promoting calcium absorption and maintaining healthy bones and muscles. What Hidroferol is used for: In adults, Hidroferol is recommended when high initial doses or spaced (monthly) administration of vitamin D are required, such as in: Treatment of vitamin D deficiency