Osteocare Fizz makes a convenient, great tasting natural orange flavour drink and is ideal for those who have difficulty with swallowing tablets. Osteocare Fizz contains the preferred D3 form of Vitamin D. Vitamin D3, also known as cholecalciferol, is the form of vitamin D that is produced by the skin on exposure to sunlight. D3 is the preferred form of vitamin D because it is the specific form made in the human body and therefore more effective than D2 which is found in some supplements.