As you soak in rays of almost-summer sunshine, your thoughts may turn to vitamin D — because you probably know it has something to do with the sun. But do you actually know what it is?
Humans are kinda capable of photosynthesis, and they use it to produce what scientists believe to be the oldest hormone that has ever existed on earth. It’s vitamin D, and it’s been around 750 million years, ever since tiny phytoplankton began cranking out the stuff in what is now the Atlantic Ocean.
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