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I have heard people saying that the B12 injections caused them to have painful muscle spasms and this was seen as being an unwanted side effect of the injection

Future research should investigate long-term outcomes in high-risk populations, direct comparisons between physiological and pharmacological dosages, cost-effectiveness analyses, and adherence metrics to inform optimal strategies for the prevention and management of vitamin B12 deficiency

- People with active or recent cancer history (the trial record contains a small number of cancers in the 12-week oral arm

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