can b12 injections be harmful Feeling worse after Injection: Answering concerns How Often Can I Take

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Insider's takeaway The Institute of Medicine has not established a tolerable upper intake level of B12 because studies show no adverse health effects when taking excess levels of B12, either through food or supplements

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Esposito G, Dottori L, Pivetta G, et al

If youve been diagnosed with a B12 deficiency, received a B12 shot (or a course of them), and your B12 levels are now within the normal range, but your fatigue persists, its a strong indication that your tiredness is likely due to something else

Having megaloblastic anemia can make you more at risk of suffering from osteoporosis, problems with your vision, struggle with memory, worsened cognitive functioning, and if you were to become pregnant, it increases the risk of birth defects in the fetus