well i took bcomplex which contains all the Bs. Doc told me I only need it once a month. It was free so I said ill get it a shot. I felt pretty good. My next shot ill get the box to tell you the exact name. I took the shot in my right butt cheeck. its not a virgin muscle and the pain really suprised me! Doc said if I had taken it in the arm like i suggested it would have crippled me lol. also didnt taste it. The pain only lasted about 5 mins.