First and foremost, a supplement is, by its very definition, meant to be something added to an already balanced diet. If your diet sucks, no amount of supplementation will help you. Begin by getting your diet right; then, and only then, should you consider taking supplements.
Secondly, it is important to note that supplements are not drugs. If they were drugs, they would only be available by prescription, yet GNC and bodybuilding.com do not require a physician's referral. The definition of a drug is a "chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well-being." Yes, drugs can enhance your mental and physical wellbeing, but they can also get you disqualified from any major sporting even in the world (steroids, HGH etc.).
In Episode 26, we evaluate the latest literature to help you save money on the supplements that you can do away with, and to also help you consider which select few may be best for your training.