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Despite its name, vitamin D is not a vitamin but a hormone or prohormone. An adequate intake of vitamin D may support good immune function and reduce the risk of autoimmune diseases.
Vitamin D receptors are found in cell types involved in immunity. Functions are not understood. Some autoimmune and infectious diseases are associated with vitamin D deficiency, but either there is no evidence that supplementation has a benefit or not, or for some, evidence that there are no benefits. [114] [115] [116] [117]
A 2018 review by the USPSTF found low-quality evidence that the routine use of calcium and vitamin D supplements (or both supplements together) did not reduce the risk of having an osteoporotic fracture in male and female adults living in the community who had no known history of vitamin D deficiency, osteoporosis, or a fracture. [128]
The U.S. Preventive Services Task Force released a draft recommendation advising against using vitamin D to prevent falls and fractures in people over 60. Pharmacist Katy Dubinsky weighs in.
Vitamin D 2, or ergocalciferol, is obtained from D 2 supplements or fortified food sources. [3] These two forms of vitamin D are metabolized in the liver and stored as 25-hydroxyvitamin D. [ 4 ] Before biological use, the storage form must be converted into an active form.
Ergocalciferol, also known as vitamin D 2 and nonspecifically calciferol, is a type of vitamin D found in food. It is used as a dietary supplement [3] to prevent and treat vitamin D deficiency [4] due to poor absorption by the intestines or liver disease. [5]
Mapping of several bone diseases onto levels of vitamin D (calcidiol) in the blood [6] Normal bone vs. osteoporosis. Vitamin D deficiency is typically diagnosed by measuring the concentration of the 25-hydroxyvitamin D in the blood, which is the most accurate measure of stores of vitamin D in the body.
The requirement for vitamin D is conditional, as people who get sufficient exposure to ultraviolet light, either from the sun or an artificial source, synthesize vitamin D in the skin. [ 21 ] Minerals
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