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> if it's the process that _creates_ those vitamins that's actually important/healthy.

By definition, vitamins are substances needed by an organism that it can't create itself, and must be obtained in its diet.



Vitamin D is technically not a vitamin:

https://academic.oup.com/ajcn/article/88/2/491S/4649916#1112...


Vitamin D is arguably not a vitamin because we produce it when exposed to sunlight and it's actually a hormone. I guess that makes sunlight the vitamin.


vit D is an exception here, iirc it's the only 'vitamin' that doesn't fit those criteria




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