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Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, along with numerous other biological functions. [1] [2] In humans, the most significant compounds within this group are vitamin D 3 (cholecalciferol) and vitamin D 2 (ergocalciferol). [2] [3]
Vitamin D toxicity, or hypervitaminosis D, is the toxic state of an excess of vitamin D. The normal range for blood concentration of 25-hydroxyvitamin D in adults is 20 to 50 nanograms per milliliter (ng/mL).
Elmer Verner McCollum (March 3, 1879 – November 15, 1967) was an American biochemist known for his work on the influence of diet on health. [2] [3] McCollum is also remembered for starting the first rat colony in the United States to be used for nutrition research.
The U.S. Preventive Services Task Force say vitamin D supplements do not reduce the risk of falls or bone fractures in healthy older adults. The draft recommendation notes vitamin D can be helpful ...
Vitamin D is nicknamed “the sunshine vitamin” because your body makes the nutrient when sunlight touches your bare skin. However, genetic and environmental factors, such as having dark skin or ...
Both vitamin D2 and vitamin D3 will help to increase vitamin D levels in the blood, says Pelitera. However, some studies have shown that supplementing vitamin D3 does a little bit better of a job ...
Michael F. Holick (/ ˈ h ɒ l ɪ k / HOLL-ik; [1] born 1946) is an American adult endocrinologist, specializing in vitamin D, such as the identification of both calcidiol, the major circulating form of vitamin D, and calcitriol, the active form of vitamin D. His work has been the basis for diagnostic tests and therapies for vitamin D-related ...
Cannell has hypothesised that Vitamin D deficiencies may predispose to influenza. In the controversial and non-peer-reviewed journal Medical Hypotheses, Cannell also suggested a tie to autism. [8] He founded the Vitamin D Council as a tax exempt, nonprofit, 501(c)(e) corporation and is its executive director. [citation needed]