homocysteine cysteine glutathione New Insights into the Roles of and in Pathological Processes The transsulfuration pathway: a source
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Blood 102(11):331b, 2003

[DOI] [PubMed] [Google Scholar] 34.Howarth J.R., Dominguez-Solis J.R., Gutierrez-Alcala G., Wray J.L., Romero L.C., Gotor C

Benefits of Cyanocobalamin Cyanocobalamin can be effective for preventing deficiency, but it does require an additional conversion step in the body before it becomes active
doi:10.1016/j.tox.2011.03.001, PMID: 21414382 Valko M, Morris H, Cronin MT (2005) Metals, toxicity and oxidative stress

The updated labeling information is located here