Word: hydroxyvitamin
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...found that people with low levels of vitamin D are 40 percent more likely to report respiratory infections such as colds and flu. The study analyzed data from the Third National Health and Nutrition Examination Survey, in which 19,000 participants were tested for their blood levels of 25-hydroxyvitamin D—a precursor of the vitamin that is considered the best measure of its concentration. Study participants with the lowest vitamin D blood levels were found to be much more likely to report having a recent respiratory infection. This result was even more pronounced in those with...
...breast-cancer specialist at Memorial Sloan-Kettering Cancer Center. "The supplementation wasn't adequate to raise blood levels enough in susceptible individuals to have a biological impact." Indeed, the women in the study who began with the highest blood levels of vitamin D's most active breakdown product, 25-hydroxyvitamin D, showed no change in their levels even after taking the 400 IUs daily...
Those studies might expose other factors affecting vitamin D levels that the WHI trial was not designed to track. Exposure to sunlight, for example, boosts vitamin D production in the body, and in the WHI trial, the women with the highest levels of 25-hydroxyvitamin D tended to be the leanest and most physically active, suggesting that they might spend more time outdoors...
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