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Intramuscular injection has proven to be the most effective method for those with vitamin B12 deficiencies or choosing to boost their levels for other reasons, second only to intravenous which is most often administered under emergency situations
It might be difficult to do everyday tasks like brushing your hair or getting dressed
McKenna MJ, Medved I, Goodman CA, et al
Sasha Santhakumar, What is the link between vitamin B12 and Crohn's disease
Ma WQ, Sun XJ, Wang Y, Zhu Y, Han XQ, Liu NF
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