Amino acid supplements

I’ve been into bodybuilding for about two years now, and up until this point, I haven’t touched any supplements—nothing at all, really, no proteins or anything of that sort. I’ve spent quite a bit of time scouring various websites, and it seems like almost everyone suggests that you need to be adding something extra to your regimen.
What I’m mostly curious about are amino acids; I’ve read somewhere that they help with muscle hypertrophy and that there aren't any real side effects to taking them? I suppose I'm wondering if there's any truth to that.

Could someone perhaps recommend which specific amino acids would be best to start with, and whether I should be looking into other supplements alongside them?
I was looking at some Whey Protein Isolate—is that actually worth anything?

Essentially, most people use these supplements to replenish what they lose through physical activity. If you're hitting the gym regularly, your best bet is to consult a trainer there to determine exactly what your specific regimen requires.

http://forum.teretana.net/ This is an excellent forum for these types of discussions.