b12 injections vs oral liquid vs. Supplements: Which Is Better? B12 Injection Dosage and Frequency:

Who Shouldnt Take Vitamin B12 Shots If you have certain medical conditions, supplementing with vitamin B12 injections could be dangerous (4)

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De Paepe A, Malfait F

Some patients feel as though they want more frequent injections, and occasionally we test levels to see if they are receiving adequate replacement, but Im not sure how strong the evidence is to support this. GPs should consider periodic vitamin B12 testing of higher-risk patients who take metformin, even if they dont display symptoms of deficiency, the UK medicines regulator said earlier this year

The studies and surveys referenced in this article did not report data on, or include, participants who were transgender, nonbinary, gender nonconforming, genderqueer, agender, or genderless