During the past few years, increasing attention has been given to vitamin D, with medical studies documenting the wide range of health benefits this remarkable vitamin provides. As these medical studies have been published, more researchers have started questioning the current low recommended daily intake (RDIs) amounts and many have recommended that they be raised higher.
An editorial published in the March, 2007 issue of the American Journal of Clinical Nutrition makes the case for raising the RDIs higher. As they point out, the current RDIs were based on obtaining enough vitamin D to prevent Rickets or Osteomalacia. Based on mounting evidence, the authors feel that the Institute of Medicine's recommendations for vitamin D intake are outdated and need to be reevaluated.
Most researchers are calling for an increase in the RDI to at least 1000 IU/day, and many state it should be much higher. The current upper limit is 2000 IU per day and researchers say it should be raised to 10,000 IU per day for adults.
"The balance of evidence leads to the conclusion that the public health is best served by a recommendation of higher daily intakes of vitamin D3. Relatively simple changes and low-cost changes, such as increased food fortification or increasing the amount of vitamin D in vitamin supplement products, may very well bring about rapid and important reductions in the morbidity associated with low vitamin D status. The current UL (Upper Limit) is but one impediment to this action; another is the perpetuation of outdated intake recommendations." states the editorial.
Vieth, R. et al. Editorial: "The Urgent Need to Recommend an Intake of Vitamin D that is Effective". Am. J. Clin. Nutr., 2007;85:649-50.
Editors Note: Vitamin D2 and D3 are not the same. Vitamin D3 is the form humans make on their skin and is most bioactive.