Needle and Syringe Combos Spinal Needle Size: Choosing the Right One for Your Needs Know Your Needles A Quick Nursing Guide! , Today, lets understand the different types of needles and their clinical purposes , Green Needle (21G) For IM injections like vaccines or 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 Best Needle For B12 Injections (Size & Gauge) PA Relief Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium