Vitamin D is not really a vitamin. It is only historically called one.
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It was not until 1919 that vitamin D was identified as the key anti-rachitic agent and became available for treating children and adults alike.2 Large doses were often used during the 1930s and 1940s, a period when nutritional deficiencies were rampant as a result of economic and political upheavals. Research on the mechanism of action of vitamin D continued and by 1969 the biologically active metabolite of vitamin D - 1,25(OH)2D - was identified. 3 1,25(OH)2D is a steroid hormone activating a nuclear transcription factor, the vitamin D receptor (VDR), which regulates the transcription of vitamin D responsive genes.4 Despite the original misnaming of vitamin D (since it is actually a prehormone) this term has continued to be used.
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from
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1240026/
The current research into Vit D has changed our understanding of how this substance works in the body, and how adequate levels can prevent serious illnesses. So old thinking at least for this "vitamin" is out the window for now.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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