Vitamin D

November 15, 2017

vasi - vitamin d


Vitamin D is a fat-soluble vitamin in a family of compounds, including Vitamins D-1, D-2, and D-3, which are obtained from sun exposure, foods, and supplements. Unfortunately, it is only naturally present in very few foods, but can be found added to certain foods and drinks, or as a supplement. It is produced when ultraviolet B rays from sunlight come into contact with the skin and trigger Vitamin D synthesis. Scientifically, ultraviolet rays with a wavelength of 290 – 320 nanometres penetrate the uncovered skin and convert cutaneous 7-dehydrocholesterol to previtamin D3, which in turn becomes Vitamin D3. UV radiation does not penetrate glass so sunshine through a window will not produce Vitamin D. This is the same with sunscreen and clothing. This vitamin is biologically inert and requires two hydroxylation’s in the body for activation. The liver converts the Vitamin D into 25-hydroxyvitamin D (also known as calcidiol), then the kidneys help to form 1,25-dihydroxy vitamin D (also known as calcitriol). Vitamin D affects as many as 2,000 genes and has many roles in the body, some of which inclu

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