what product do i buy to gain muscle?!

no magic pill
u eat more calories.. 20x your current body weight
one gram of protein for each lbs that u weigh

and supplments that will help are whey protein and glutamine...
u cannot just rely on supplments
and sometimes food all by itself is not enough

u need a combination

eat alot of tuna, salmon, chicken breast, beef, rice, yams, whole wheat pasta

You're whole program is probably the issue. Spend the $20 to buy the weight training program at americandreambody.com. It will educate you on the science of weight training and nutrition and will give you a program that actually works. You are either not training heavy or intense enough, getting enough rest, or eating enough food. If any one of those things is lacking, then you're results are going to be severely compromised.

Protein shakes do work though. Optimum Nutrition is the best on the market. I would also recommend buying some Carbo Gain from NOW to mix some carbs in with your protein shakes. Most weight gainers that you find out there mix whey protein with maltodextrin, which is what Carbo Gain is.

http://www.americandreambody.com/

Try using Bee Pollen from your local Health Food store (as long as
your not allergic to bee stings of course)

It's a great natural stimulator of lean muscle mass, even if
you don't work-out that much.