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As noted above, it's been shown to be as, if not more, effective in maintaining healthy vitamin B12 levels compared with methylcobalamin

However, subjective drug effects were comparable on the morphine-benzedrine scale (euphoria), amphetamine scale, and benzedrine (stimulation) scale of the Addiction Research Center Inventory (ARCI) (Jasinski and Krishnan, 2009a)

Anything free or super cheap when it comes to b12 is going to be the type of B12 called Cyanocobalamin

[DOI] [PubMed] [Google Scholar] Papanicolaou, D
