I bought some B12 when I was buying needles so I wouldn't get hasselled I took a few shots of it. What does B12 do to you and for you and is it true that if you take a shot and your piss if slightly red that you have enough in your system? Thats why I took a couple of shots everytime I took one my piss was the normal colour so I thought that I had enough. Am I just wasting my time taking this or is it a good idea?