# Vitamin D

By [Untitled](https://paragraph.com/@0x52a43fc96b9d28363351ea8229d0b495bb6db8af) · 2024-01-21

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**Vitamin D** is a group of [fat-soluble](https://en.wikipedia.org/wiki/Lipophilicity) [secosteroids](https://en.wikipedia.org/wiki/Secosteroid) responsible for increasing intestinal absorption of [calcium](https://en.wikipedia.org/wiki/Calcium), [magnesium](https://en.wikipedia.org/wiki/Magnesium), and [phosphate](https://en.wikipedia.org/wiki/Phosphate), and for many other biological effects.[\[1\]](https://en.wikipedia.org/wiki/Vitamin_D#cite_note-lpi-1)[\[2\]](https://en.wikipedia.org/wiki/Vitamin_D#cite_note-ods-2)[\[3\]](https://en.wikipedia.org/wiki/Vitamin_D#cite_note-Norman_2008-3) In humans, the most important compounds in this group are vitamin D3 ([cholecalciferol](https://en.wikipedia.org/wiki/Cholecalciferol)) and vitamin D2 ([ergocalciferol](https://en.wikipedia.org/wiki/Ergocalciferol)).

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*Originally published on [Untitled](https://paragraph.com/@0x52a43fc96b9d28363351ea8229d0b495bb6db8af/vitamin-d)*