best spot to give b12 injection Vitamin Sites: Where Inject B12 · PA Relief Choosing the Right Needle and

Set a timer if impatience tempts you to shake

They may recommend laboratory testing to evaluate for anemia, thyroid dysfunction, vitamin deficiencies (particularly B12 if you also take metformin, vitamin D, and iron), or other metabolic abnormalities

How often are injections needed after repletion

Dalrymple SN, Lewis SH, Philman S

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In this study, the serum half-life of inositol following a single IV dose was 5.22 hours and after multiple IV dosing was 7.9 hours