best needle gauge for b12 injection Choosing the Right and Syringe Injections: A Complete Guide What gauge and length needle
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Everyone responds a little differently
[1] Other rare side effects noted (mostly in older literature or high-dose use) include: polycythemia vera and peripheral vascular thrombosis in patients receiving repeated injections (though these associations are not well understood, they were listed in prior product literature as possible adverse events)

Dysgeusia is the name for a painful, burning sensation as part of burning mouth syndrome

doi: 10.1016/j.clnu.2018.02.007
