what size needle to inject b12 A Guide the Best Needles for Injections gauge needle for b12 injection

A vitamin B12 supplement is another option if you're not getting the recommended 2.4 micrograms per day

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So, inject daily for three months, and only then gauge how you feel

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Injectable B12 has few direct drug interactions, but certain medications can interfere with B12 absorption or measurement: Chloramphenicol: This antibiotic may antagonise the haematological response to B12 in some patients, potentially preventing the expected rise in red blood cell count