B12 Shots for Energy: Do They Work, Who Needs Them & What to Expect Greenwich Medical Spa Vitamin B12 (cobalamin) and folate (vitamin B9) are vitamins that serve important functions in the human body. Folate is needed for development and growth of cells (including red blood cells) and synthesis Vitamin B 12 Injection, 3,000 mcg mL at Tractor Supply Co Vitamin B12 for Injection Cyanocobalamin 1,000 mcg, 25 Box (Rx) Mountainside Medical Optimal B12 Injection Sites for Maximum Absorption and Benefits Your Health Magazine