B12 Injection ActiveMD VITAMIN B12 (Generic) Injectable Solution, 1000 mcg mL, 100 mL vial Easy Refills Chewy Rx B 12 (Methylcobalamin) Therapy MedClub by Dr Jenn 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 At Home Vitamin B12 4 Week Injection Package MUST BE A FLORIDA RESID CardioMender, MD Compounded Methylcobalamin (Vitamin B12) Injection, 5mg mL