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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)

Its true that vitamin C has an important function in the body, but its controversial whether taking additional vitamin C orally or by injection offers any advantage for people who consume adequate vitamin C in their diet

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