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That’s because Vitamin D is actually a hormone rather than a vitamin. The ultraviolet rays from sunlight trigger its production in our skin.

Few foods naturally contain vitamin D and bananas are not one of them. Vitamin D concentrate is commonly added to milk.

Pretty sure it’s what they named the alphabet after.

“Vitamin” is basically the 19th century’s idea of a sciencey word for “nutrients.” I mean heck, half the “vitamin Bs” aren’t even related to each other at all