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At first, shots might be given weekly or every two weeks
Insert the needle at a 45 to 90 degree angle depending on your body composition
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Expected Duration of B12 Injection Benefits The duration of vitamin B12 injection benefits can vary based on individual factors, but in general, the effects of a single injection can last for several weeks to several months
doi:10.1016/j.pharmthera.2021.107916
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