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. 2020 Oct 13;12(10):2965. doi: 10.3390/cancers12102965

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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Chemical structures of vitamin D₃, D₂, 25(OH)D and 1,25(OH)₂D. Structural differences are highlighted in blue. 25(OH)D: 25-hydroxy-vitamin D or calcidiol; 1,25(OH)₂D: 1,25-dihydroxy-vitamin D or calcitriol.