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No injections for most
For malabsorption (e.g., pernicious anemia), injections are often preferred, though some clinicians still use very high-dose oral regimens (NIH ODS)
Published preclinical studies use it as a chemical tool to investigate NNMT activity, nicotinamide metabolism, cellular methyl-donor balance, NAD-related pathways, and adipocyte biology in cell and animal models
Clinicians use different forms of vitamin B12: cyanocobalamin, hydroxocobalamin and methylcobalamin
Only one of these four, methionine, is an amino acid
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