You don’t get vitamin D from sunlight. Sunlight hitting your skin causes a chemical reaction that creates Vitamin D out of other things your body already has.
But our bodies are not our only sources of Vitamin D, or any vitamin. Our food gives us a vast majority of the vitamins and minerals we need, including Vitamin D. Vitamin D is high in some fatty fish, Eggs, Cheese, and Beef Livers.
So any of these could be used as sources of the Vitamin D to make it into pill form. However, I think normally it’s artificially created nowadays. I’m not 100% sure though on that part.
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