Lets pinch subcutaneous injection sites! When I said heparin and enoxaparin are exclusively used in the abdomen, I dont mean other meds cant go there. We just generally put anticoagulants in the 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 Methylcobalamin Injection (Vitamin B12) Farbe Firma CYANOCOBALAMIN INJECTION, USP 10,000mcg 10mL (1,000mcg mL) 10mL VIAL