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how long of a needle for b12 injection Size Injection: A Simple Guide Can a 30 gauge (g)
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10.1177/15648265080292S117 [DOI] [PMC free article] [PubMed] [Google Scholar] 10
Safety, Oversight, and the Risks of Self-diagnosing at Home B12 is generally considered safe when used appropriately, but safe doesnt mean always appropriate. The bigger risk is missing the underlying diagnosisespecially when low cobalamin is a clue pointing toward chronic gastrointestinal disease (Simpson KW, 2001)

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Generally, no harm comes from vitamin B12 injections, which are usually quite safe
