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Too much vitamin D raises mortality risk

Recently, the most hated webzine in supplements-land wrote a piece on the increased chance of fatal strokes and heart attacks as a result of too high vitamin D levels. The Danish researchers on whose study that post was based also published an article about a 2012 study on the effects of vitamin D on mortality.

Vitamin D3
We lifted the figure shown below from the Danish study, which was published in the Journal of Clinical Endocrinology and Metabolism. The researchers based their study on data on a quarter of a million Danes, who the researchers monitored for just over three years.

As you can see, mortality is lowest when the vitamin D level is 50-60 nanomoles per litre. The figure doesn't show mortality due to cardiovascular disease only, but all cases of death.

Too much vitamin D raises mortality risk

The results of this study were the reason for the study we wrote about recently. In that post we already wrote that these findings don't suggest that vitamin D supplementation is therefore dangerous.

The average Westerner's vitamin D concentration in the blood is way below the optimal level. It's possible to attain an optimal level by taking a vitamin D supplement, but extreme doses can raise the vitamin D level above this optimal level.

J Clin Endocrinol Metab. 2012 Aug;97(8):2644-52.

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