how does sunlight help the body make vitamin

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And how much sun does one need to have enough vitamin D?

In: Biology
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I used to draw diagrams when explaining this sort of stuff to reddit, but y’all don’t appreciate it. Anyway:

Basically some chemical bonds start to break up upon exposure to light/radiation. In this case, some types of cholesterol have some of their bonds swapped into a form the liver can synthesise into vitamin D.