The reason we need to be outside to keep our vitamin D levels up is that sunlight contains UVB with a wavelength of 280-315 nm, and stimulates the production of vitamin D.
In doing the research for this post I’ve found out that the most beneficial times of the day for topping up our Vitamin D are sunrise and sunset. Have you ever attended photography lessons? Or read about professional photographers who like the light at sunrise and sunset or the hour just before each of those times – it’s called the golden hour. I wonder if the two are linked.
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