In addition to containing 1000 i.u. of vegetarian vitamin D3, D Complex naturally also provides vitamin D2 as found in shitake mushrooms. Thus, D Complex is more complete and a superior choice of vitamin D. No other product on the market is like D Complex.
Most commercially available sources of what they call vitamin D are made up of unnatural isolates-they are not foods.
Some of these studies (or citations) may not conform to peer review standards (though most do). Therefore, the results are not conclusive. Professionals can, and often do, come to different conclusions when reviewing scientific data. None of these statements have been reviewed by the FDA. All products distributed by Doctors’ Research, Inc. are nutritional and are not intended for the treatment or prevention of any medical condition.