Injectable b12

[irish_2003]

1. Due to my extreme sleepiness midday I purchased couple 10ml vials of b12...injected 1ml with slin pin into chest Tuesday and was gonna do 3x a week 1ml and then once a week after that (morning injects)
   
   What are your experiences using b12 and as former bodybuilder at 51yrs how would you recommend dosingg?