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[DOI] [PMC free article] [PubMed] [Google Scholar] 160.Min, A
Already bought a vial online and unsure if it's safe to use
National Diet and Nutrition Survey: Headline Results from Years 1, 2 and 3 (combined) of the Rolling Programme 2008/09 2010/11 (Report)

Methylcobalamin is generally more expensive
Can refrigerate after opening, especially in very hot climates
