Thanks doc... I'll consider that... but how about creatine? I see it everywhere and there's a ton of them in the market and for an average guy like me trying to be fit. It is very hard to decide what to get, not to mention if I'm getting my money's worth.
I'll tell you from experience and from the fact I'm a fairly muscular/lean individual (~205lbs and 10-12% bf, if that gives me any credit).
You don't NEED anything to achieve your physique/fitness goals.
Things that are proven to help, though, are:
Caffeine/Stimulants (CNS boost, increases endurance and strength performance)
Creatine Monohydrate (Helps some, doesn't help others - only monohydrate is worthwhile)
Protein Powders (Purely for convenience and lack of fat/carbs if dieting, it's basically just food in powder form)
Multivitamin (This is just in case you eat a limited selection of food)
Fish Oil Pills (General Health)
Beyond that, eating well and lifting/working out intensely is going to be the biggest factors - the things listed will make a very small difference.
If you're strapped for cash, I'd recommend just sticking to food (maybe get protein powder, since it's cheaper per gram of protein than most foods)