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In a 2020 case study , researchers reported a young woman treated with multiple daily doses of 1 milligram (mg) of cyanocobalamin (synthetic vitamin B12) for severe pernicious anemia (lack of red blood cells due to vitamin B12 deficiency)

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Glutathione should be avoided if youre currently getting chemotherapy

Its mix can change based on how its used and how its given

There is no research showing that taking well over the recommended daily or weekly amount of B12 can be unsafe or detrimental to your health, and an official upper tolerable intake level has yet to be established