I have been researching bodybuilding supplements for many years, as a bodybuilding enthusiast.
Two of the best sources for good exercise advise are hardgainer.com and exercisecertification.com
The only supplements that are worth trying IMHO are protein (whey), creatine and glutamine (for immune system).
If you are into sports and bodybuilding I am sure you’ve heard about creatine.
Creatine is very cheap so the big companies… are trying to find ways to package it in new ways and sell it for higher prices for bigger profits 
There are a lot of lies about creatine right now. Every now and then a new miracle creatine product appears. Forget about all the hype.
In order to use creatine you must use the old good way of cycling.
For one week you must take creatine on empty stomach 3-5 times daily. Use 5gr of creatine (Creapure certified micronized creatine monohydrate is a very good choice) with 50gr of a simple carb like sugar or even better dextrose, diluted in a glass of water.
After the first week use 5gr+50gr dextrose 1 hour before workout and the same amount after workout (if it’s not a workout day just take creatine twice daily).
I found a fantastic page with information about creatine myths at bodybuilding.com
http://www.bodybuilding.com/fun/tallon8.htm
