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Vitamin D and Omega-3 Trial (VITAL) [1] was a clinical trial designed to investigate the use of daily dietary supplements of vitamin D and fish oil.. The sponsor of the study was Brigham and Women's Hospital, collaborating with The National Cancer Institute, National Heart, Lung, and Blood Institute, Office of Dietary Supplements, National Institute of Neurological Disorders and Stroke ...
Giovannucci is known for his research into the health benefits of obtaining vitamin D through sunlight exposure. [4] [5] He has said that for every death caused by skin cancer resulting from sun exposure, 30 deaths might be prevented due to increased vitamin D intake, [4] and that "It does seem that Vitamin D levels seem to be a real predictor of heart disease."
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 indicating there are no benefits. [114] [115] [116] [117]
Research has also linked a lower vitamin D status to an increased risk of ischemic stroke, heart attack and heart disease. How much vitamin D do I need? Older adults need about 600 – 800 IU of ...
Most people in the world depend on the sun to get vitamin D, [31] and elderly populations in low UVB countries experience higher rates of cancer. [32] There are not many foods that naturally have vitamin D. [33] Examples are cod liver oil and oily fish. If people cannot get sunlight, then they will need 1,000 IU of vitamin D per day to stay ...
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).
To be eligible for the study, participants must live in one of 20 states or Washington, D.C., which together account for than 90% of the U.S. population of Black women ages 25 to 55.
While low blood levels of vitamin D are correlated with increased cancer risk, [150] [151] [152] whether this relationship is causal and vitamin D supplementation is protective is not determined. [153] [154] One 2014 review found that supplements had no significant effect on cancer risk. [154]