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Cyanocobalamin Pharmacokinetics European Journal of Cardiovascular Medicine: Vitamin B12 Deficiency in Long-Term Metformin Users USFDA Adverse Event Reporting System: Vitamin B12 Deficiency Associated with Metformin and PPIs MedRxiv (PNAS Preprint): Patient-Reported Treatment Outcomes in ME/CFS and Long COVID Journal of Neurological Sciences / Nutrients: Cognitive Function and Neuropathy
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In small doses, they can cause fever, tiredness and aches, but in large amounts, they can trigger life-threatening conditions like septic shock
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