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Vitamin B12 Vitamin B12 plays a vital role in red blood cell production, neurological function, and cellular energy metabolism

(PMC) A separate metabolism-focused paper reviewing human trial history makes a similar point: early signals of weight loss were not consistently reproduced in later studies, particularly when intensive diet/exercise protocols were included

doi:10.1016/j.clinthera.2011.05.088

Indications: post-illness convalescence, neuropathy, chronic fatigue, pre-/post-surgery vitamin support, bariatric malabsorption

Lee WL, Chen JW, Ting CT et al (1999) Changes of the insulin-like growth factor I system during acute myocardial infarction: implications on left ventricular remodeling