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can you inject vitamin b12 yourself How to Give a Shot How to Self-Inject Vitamin B12
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Previous reports that megadoses of vitamin C destroy vitamin B 12 have not been supported (147) and may have been an artifact of the assay used to measure vitamin B 12 status (21)

Vitamin B12 does have the potential to react with certain medications including chloramphenicol, proton pump inhibitors, H2 receptor antagonists, and Metformin

Neurological symptoms like tingling or numbness could take several weeks or months of consistent treatment to improve