Many experts believe that vitamin D3 is more important that vitamin D2. But Michael F. Holick, Ph.D., M.D. and author of the book The Vitamin D Solution has put this myth to rest.
Vitamin D3(also known as cholecalciferol), is synthesized in the skin upon contact with Sunlight. Whereas D2 is made from yeast and is used for fortification of food and supplements for as more as sixty years. It has, however, been accused of being less effective than vitamin D3 in preserving 25-vitamin D levels. The promotion of the idea that people should be careful about their vitamin D supplement and be sure that they are taking vitamin D3 instead of vitamin D2 should be widespread. In 2008, Dr.Holick stated that when healthy young and middle-aged adults consumed 1,000 IU of vitamin D, they increased their blood levels of 25-vitamin D to the same amount as healthy adults consuming 1,000 IU of vitamin D3.
Vitamin D2 wasn’t enhancing the destruction of vitamin D3 and to be sure of it, Dr.Holick planned the study to comprise a group who received 500 IU of each, vitamin D2 and vitamin D3 in the same capsule. His team observed that the blood levels of 25-vitamin increased by ten nanograms (ng) per millilitre and was comparable to the level achieved by ingesting either 1,000 IU of vitamin D2 or 1,000 IU of vitamin D3. In simpler words, he established that vitamin D2 is just as effective as vitamin D3 and put to rest this myth once and for all.
Vegans who don’t want any animal sources in their supplements can opt for vitamin D2 as their supply. Otherwise, vitamin D3 is the ideal source of in taking vitamin D in your body. For severe vitamin D deficiency with high dosage of prescribed vitamin D (up to 50,000 IU per dose), doctors recommend D2. It is presently the only FIA-approved vitamin D which is available to physicians for treatment and prevents vitamin D deficiency at that dosage, and it works pretty well.