When it comes to vitamin D, there really is such a thing as 'too much of a thing,' at least according to a study recently published in the online American Journal of Cardiology.
One of the purposes of vitamin D is to help stave off cardiovascular disease by suppressing a linked protein, the C-reactive protein (CRP). This protein is an indicator of inflammation, which is successfully suppressed by the vitamin only to a certain point.
Johns Hopkins University surveyed 15,000 individuals between the ages of 18 and 85. Those whose blood levels increased above 21 nanograms per milliliter exhibited greater CRP levels, which is the opposite of the vitamin's purpose. 21 ng/mL is also the lower limit of what has been consider normal. Every 10-unit increase in the level of vitamin D led to an increase of 0.06 milligrams per deciliter of CRP. Researchers held obesity, smoking, cholesterol, and high blood pressure constant.
The lead researcher advised for vitamin D to be consumed, but for blood to be drawn and analyzed to monitor levels.
Prior studies have had conflicting results, which the Johns Hopkins researchers surmised was due to the nature of the vitamin, as their study illustrates.
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