I just don't think they are beneficial as far as performance or muscle building is concerned.
I think it's far safer to eat a variety of natural foods, than focusing on pills and powders, but - I also think that taking supplements aren't going to shorten your life if you follow a good healthy eating plan.
You never know, there could be just some of those elements needed.
The only substances that seem to make a difference are the illegal ones.
The body is complex, no one really knows.