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How Long Do the Effects From Each Normal Recommended B12 injection dosage for adults Last
Pickart estimated lethal dose at approximately 22,500 mg for humans (300-fold above effective doses), with animal LD50 studies in mice showing 8 mg per 25g mouse (320 mg/kg, translating to ~22,400 mg for 154 lb human)
Reviews flag this as an unresolved question, especially in patients with current or prior cancer (Sehgal et al., Pharmaceuticals, 2025)
Different cobalamin forms may be discussed in specific clinical situations
Kraemers targeted therapeutic supplements
Growth Hormon IGF Res 8:3945 Flyvbjerg A, Bennett WF, Rasch R, Kopchick JJ, Scarlett JA (1999) Inhibitory effect of a growth hormone receptor antagonist (G120K-PEG) on renal enlargement, glomerular hypertrophy, and urinary albumin excretion in experimental diabetes in mice
