Higher levels of vitamin D correspond to lower cancer risk, researchers say

Note that too much vitamin D is toxic. After I started taking 1000 IU, I started feeling yucky. I reduced it to 500 and began to feel ok again. Vitamin D is fat soluble, so can build up in the body.

http://www.eurekalert.org/pub_releases/2016-04/uoc--hlo040616.php

Public Release: 6-Apr-2016
Higher levels of vitamin D correspond to lower cancer risk, researchers say
University of California - San Diego

Researchers at University of California, San Diego School of Medicine report that higher levels of vitamin D - specifically serum 25-hydroxyvitamin D - are associated with a correspondingly reduced risk of cancer. The findings are published in the April 6, online issue of PLOS ONE.

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Garland and his late brother, Frank, made the first connection between vitamin D deficiency and some cancers in 1980 when they noted populations at higher latitudes (with less available sunlight) were more likely to be deficient in vitamin D, which is produced by the body through exposure to sunshine, and experience higher rates of colon cancer. Subsequent studies by the Garlands and others found vitamin D links to other cancers, such as breast, lung and bladder.

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The only accurate measure of vitamin D levels in a person is a blood test.

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Garland does not identify a singular, optimum daily intake of vitamin D or the manner of intake, which may be sunlight exposure, diet and/or supplementation. He said the current study simply clarifies that reduced cancer risk becomes measurable at 40 ng/ml, with additional benefit at higher levels.

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