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Too much vitamin D can be harmful

By Tim Sandle     May 12, 2013 in Health
Health shops often have vitamin supplements for sale. However, with vitamin D research suggests that very high blood levels of vitamin D confer no additional benefit and could, in fact, be potentially harmful.
Many health shops, when selling vitamin supplements, indicate that there are hazards associated with low vitamin D levels. In addition, some medical advice suggests that people should take vitamin D supplements to protect against hardening of the arteries, hypertension, diabetes, weak bones, and a range of other illnesses.
However, too much Vitamin D can cause problems according to new research carried out by Muhammad Amer. Amer summarizes his findings, by stating: "Healthy people have been popping these pills, but they should not continue taking vitamin D supplements unchecked. At a certain point, more vitamin D no longer confers any survival benefit, so taking these expensive supplements is at best a waste of money."
For the study, Amer, along with his colleague Dr. Rehan Qayyum,reviewed data from over 10,000 participants in NHANES (National Health and Nutrition Examination Survey) from 2001 to 2004. They then matched the data they had gathered with those contained in the National Death Index through the end of 2006.
When the scientists examined details on deaths, the New York Times notes, from all causes and specifically cardiovascular disease, they found that people whose blood levels were at the top range of what the Institute of Medicine considers "adequate" (21 nanograms per milliliter of 25-Hydroxyvitamin D) had a 50% lower risk of dying prematurely. However, as blood levels of vitamin D rose above 21 nanograms per milliliters, that protective effect seemed to wear off.
The inference is that taking supplements provides no additional health effects. In fact, the reverse could be true. The team has also found a link between excess vitamin D and raised levels of homocysteine, which can increase the risk of cardiovascular diseases.
The research was conducted at Johns Hopkins University and reported in the American Journal of Medicine
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