reviewed the evidence as to whether any of the available forms of B12 are superior, and concluded that all forms can be converted to the active methyl- and adenosyl-B12 forms, and that there was not sufficient evidence to suggest that any form was superior in terms of bioavailability, biochemical effects or clinical efficacy
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In some cases, independent testing has revealed contaminants, degraded compounds, or dosages that are significantly higher or lower than advertised
PMID 26385097
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