This is the time of year when those of us who live in the Northern Hemisphere, and/or avoid sunshine (or use sunblock) will be maximally Vitamin D Deficient. The active form (!,25OH2D3), under direction from the parathyroid glands controls calcium absorption, and circulating ionised calcium levels. This vital whole-body hormonal role, however, is not its only one; there are many others, including your immune system that operate below the radar, and they are especially vulnerable to D-deficiency. Many viruses, including Covid-19 ‘know’ this, and will exploit the consequent weakness of the immune system. So I argue the case for every adult taking, NOW, a single dose of 100,000 Units of Vitamin D3, (cholecalciferol), to boost your resistance. If your levels of the storage form 25OHD are already adequate this will do no harm. But if they are low it will allow the liver (that makes 25OHD) to immediately get to work, and boost local levels to ones that tissues below the ‘endocrine radar’, including the immune system, can use to help them fight the invader.
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