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However, some rare side effects of too much vitamin B12 can include: Headache Weakness Nausea Diarrhea Tingling sensations in the hands and feet Allergic reactions or skin rash (uncommon) When To Seek Medical Advice Risk of vitamin B12 deficiency: Groups at a higher risk of vitamin B12 deficiency include older adults, people who only eat plant-based foods (vegans and vegetarians), and those with certain chronic conditions (gastrointestinal disorders that can affect vitamin absorption)

10.1002/hep4.1892 [DOI] [PMC free article] [PubMed] [Google Scholar] 114.Fuchs A, Samovski D, Smith GI, Cifarelli V, Farabi SS, Yoshino J, et al

clinical trials in humans have been limited

Maker JJ, Friedman SL