What are the best supplements to take for building muscle mass?

Question

What do they do and when should you take them? Where can you buy them at? =)

Answer 1

Your basic supplements are:
Whey Protein- Take before and after workout
Creatine- To give you ATP while working out and draw water into the muscle (consume with lots of water).
You can buy these at GNC

Answer 2

you can buy most of them at GNC and the best ones are N.O. Explode and Cellmass, made by BSN, i found that if you stack all of their supplements you get a good pump, kind of expensive though.