Hey, no offense, but if you've been lifting for 5 years with no results, then supplements are the last thing you should be worrying about.
Are you sure your diet is where it needs to be, and that you are progressing in the gym? If you give info about your diet, routine, and goals then you will probably get more specific help.
There's nothing worse than busting your ass in the gym and then not seeing results. Believe me, I know from experience.