Who discovered vitamins, and why are there only five main ones (A thru E)?? What do they look like out of pill form? How long have we known about them? How do you test for them? I mean, how do we KNOW that there is a crap load of Vitamin C in oranges? Who looked in there? And did we know about vitamin C before we found out that oranges had a lot of it?
What's the difference between a vitamin and a mineral?
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