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 a disposable syringe with a needle and an ampoule with red (vitamin B12) liquid in male hands in blue (lilac) nitrile gloves. On a white background Stock Photo Alamy Mecobalamin 1500mcg (Vitamin B12) Injection Prefilled glass Syringe ZYOVIT12 AQ PFS at 186.56 piece Ahmedabad ID: 2855242980230 Does size matter? Historically, a bigger needle gauge was considered better to prevent damage to red blood cells. However, our recent guidelines recommend using smaller gauge needles (2325 G) for all