What are the benefits of getting B12 shots?

B-12 is used to clean throttle body and any carb parts. I have used b-12 to get cars into the shop when fuel pump has went out on gas engine. You just spray it right in the throttle body/carb. That would be the spray b-12. Now the liquid b-12 can go directly in the gas. Usely one can per 21 gallons. It cleans valves, injectors, o2 sensers, spark plugs, etc.... It is multi purpose cheamical.