Choosing Between the B12 Shot and Patch Thinworks 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 B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief