All sites where i inject im vitamin b complex are bruised. sites where i inject vitamin b12 are not. why?

Did I misunderstand?: You're a young adult who lists no terribly serious illness for which you would require injectable vitamins of any sort rather than vitamins taken orally. If someone has told you that "injections are better", perhaps because they are painful, i would question this advice. You clearly value your health & i'd urge you to reconsider injecting yourself at all, or get with a mainstream dr.

Don't know: May be something about the technique or volume of injection. Why on earth are you injecting either one?