Feed back on the injectable B-12

[The One]

There is a guy in my gym he is in his 40s says he is using injectible B12 and is making him feel strong. I would like a little feedback about this from u guys that have tried this. I want to know if buy injecting b12 is better and yields greater strength and for how long.

 

[jarabbit]

Bump, how much a week should be taken, any negative sides with b-12 usage?