Cholecalciferol (vitamin D3) comes as a capsule, gel capsule, chewable gel (gummy), tablet, and liquid drops to take by mouth. It is usually taken once or twice daily depending on the preparation, your age, and your medical condition(s). Cholecalciferol is available without a prescription, but your doctor may prescribe cholecalciferol to treat certain conditions. Check with your doctor or pharmacist before taking a cholecalciferol (vitamin D) supplement. Take cholecalciferol at around the same time every day. Follow the directions on your product label or doctor's instructions carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take cholecalciferol exactly as directed. Do not take more or less of it or take it more often than recommended by your doctor.