We need this vitamin now, more than ever.
For those of us who are residents of the Northern Hemisphere, now’s the time to go outside and make some much-needed vitamin D. Except, of course, we can’t. Most of us are in lockdown, and that leaves a big, vitamin D-shaped hole in our lives. Liver stores of this hormone-like vitamin ran out long ago — we can only make vitamin D in spring and summer. Fortunately, backup is available.
We need the sun to make vitamin D, a clear indication that humans are built for the outdoors. This vitamin is made in the skin on exposure to solar ultraviolet B (UVB). There are two dietary forms of vitamin D: D2 (ergocalciferol) and D3 (cholecalciferol).
The form that humans make and use is vitamin D3. Vitamin D3 is converted to 25(OH)D, the form that circulates in the blood. Measurement of blood 25(OH)D is the standard test for vitamin D levels.
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