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For patients with impaired liver function or genetic variants affecting B12 metabolism, methylcobalamin may be preferable
Institute of Medicine Food and Nutrition Board on the Scientific Evaluation of Dietary Reference Intakes Dietary reference intakes for thiamin, riboflavin, niacin, vitamin B6, folate, vitamin B12, pantothenic acid, biotin, and choline: National Academies Press (US)
Lc-Ms Identity Mass spectrometry confirms the molecular weight matches the peptide you ordered, so you know the label is honest and not a swap
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