does a b12 injection work straight away This Is How Long It Takes For Vitamin To Start Working How Long Does It Take

2017 Dec 21;3(1):17040

CPT 96374, by contrast, covers intravenous (IV) push administration where the substance is delivered directly into a vein, typically by a syringe, and the administering provider must be present during the entire infusion

Many people looking into B12 options also consider injectables as a way to support anti-aging benefits

Frank, S.J., et al

If a pregnant patient has a documented deficiency of one or more B vitamins or a condition like hyperemesis that prevents oral intake, the benefits of correcting the deficiency (preventing serious maternal and fetal complications) outweigh any minimal risk from the injection