How many different D vitamins are there and what do they all do?
asked Jun 22 '11 at 16:30
The major forms of D vitamins are D1 (compound of ergocalciferol with lumisterol), D2 (ergocalciferol), D3 (cholecalciferol), D4 (dihydroergocalciferol), and D5(sitocalciferol). D2 and D3 are the two main forms that humans ingest.
D vitamins are essential for preventing rickets, maintaining healthy hair follicle growth, and maintaining bone mineral density. There is some evidence emerging that Vitamin D deficiencies play a part in cadiovascular disease and cancer, but these are anecdotal.
Best sources of Vitamin D are fish, fortified milk, eggs, and cod liver oil.
answered Jul 09 '11 at 07:52