3 Different Types of B12 MedClub by Dr Jenn Vitamin B 12 Cyanocobalamin Injection 1000MCG mL 30 mL MDV Med Plus Physician Supplies Cyanocobalamin vs. Methylcobalamin: What's the difference? Both are forms of vitamin B12, essential for energy, brain health, and red blood cell production. But here's the key: Cyanocobalamin is synthetic and needs Oh My, There is Cyanide in B12 Supplements. Really. Office for Science and Society McGill University