Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2021 May 18;9:20503121211014073. doi: 10.1177/20503121211014073

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2021

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

PMC Copyright notice

Figure 1. — Synthesis of metabolically active vitamin D (1,25(OH)₂D). (a) Vitamin D is produced when ultraviolet (UV) rays from the sun strike the skin and can also be obtained from leafy vegetables, dairy products, fish, and vitamin D fortified foods. (b) Vitamin D is converted in the liver to calcidiol, or 25-hydroxyvitamin D (25(OH)D). (c) Then, calcidiol travels to the kidneys and becomes enzymatically converted to calcitriol, also known as 1,25-dihdrydroxyvitamin D (1,25(OH)₂D).