Vitamin D regulates the calcium levels in blood. A prolonged overdose of this vitamin, also known as vitamin D toxicity, causes calcium levels to rise over a certain limit, resulting in complications, such as coma and cardiac arrest. So, how much vitamin D will cause toxic levels of calcium to build up in the blood? Are the baseline levels, which are currently considered normal, accurate? John Cannell, a prominent researcher and vitamin D advocate, provides an interesting insight into this topic in his article titled, “the difference between two “normals”,” suggesting that the references taken for calculating these levels in the USA are faulty!

Source: http://blog.vitamindcouncil.org/2012/03/16/the-difference-between-two-normals/

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