Vitamin D in the form that this article is talking about cannot be purchased over the counter. It is not even a vitamin, but closer to a hormone. I don't know how it came to be popularly known as a vitamin, and wonder how many people think the the "D" supplements they are taking are 100% useless for what they are thinking.
Vitamin D hormone has been proposed to play a role in autism based primarily on a correlation between autism incidence in populations with low levels of vitamin D. Vitamin D is a fat-soluble vitamin that is converted to its biologically active form 1,25-dihydroxyvitamin D (calcitriol), herein referred to as vitamin D hormone, a steroid hormone that appears to regulate the expression of 900 different genes, a large number of which impact brain development and function (40, 41).
Except for bone health, it found no evidence that vitamin D helped with any other diseases.
"Current public health communications about vaccines may not be effective," Nyhan and colleagues write. "More study of pro-vaccine messaging is needed."
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