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Very few foods naturally supply vitamin D. Beef liver, cheese, egg yolks and fatty fish, which contain small amounts of D3, are the best dietary sources of D3. Cod liver oil provide a time-honored potent source of D3, although the taste might be a turnoff.Why is vitamin D2 all that the doctors prescribe?
Vitamin D2 is used to treat hypoparathyroidism (decreased functioning of the parathyroid glands). Vitamin D2 is also used to treat rickets (softening of the bones caused by vitamin D deficiency) or low levels of phosphate in the blood (hypophosphatemia). Vitamin D2 may also be used for purposes not listed in this medication guide.