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. 2014 May 5;6(5):1861–1873. doi: 10.3390/nu6051861

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© 2014 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

Structural formula of Vitamin B₁₂ and partial structures of Vitamin B₁₂ compounds. The partial structures of the Vitamin B₁₂ compounds only show the regions of the molecule that differ from Vitamin B₁₂. (1) 5′-Deoxyadenosylcobalamin; (2) methylcobalamin; (3) hydroxocobalamin; and (4) cyanocobalamin or Vitamin B₁₂.