B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics On The Go B12 Injection at enTrust Urgent Care Center Clinic Compounded Methylcobalamin (Vitamin B12) Injection, 5mg mL B12 Injections: Who Should Get Them and How Long Do They Last? Can you buy ampules of vitamin B12 over the counter? B12 Methylcobalamin vs Hydroxocobalamin The difference between in clinic B12 injections vs over the counter. There are many forms of vitamin B12, the form used at La Bella is Methylcobalamin. The