On The Go B12 Injection at enTrust Urgent Care Center Clinic B12 Injection Frequency: How Often Should You Get a B12 Shot? Liv Hospital B12 injections training course 300 One day course perscriber set up for prescriptions with our nurse insurance referral learning how to take blood pressures included each injection would cost you around 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