The B12 Shot: What Every Human Needs to Know About Injectable Vitamin B12 B 12 (Methylcobalamin) Therapy MedClub by Dr Jenn What size of needle is best for IM injection Dr. prescribed B12 injections. Pharmacy only gave me vials. Where do you get your needles and syringes? What size?? Where do I inject? : r B12_Deficiency
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