Ok, I never wanted to get into this that deep on those forums or these, but I suppose if you want my rationale...
Because something "works" does not mean it is optimal. Obviously doing any type of physical activity will yield greater results then nothing at all. I would never deny otherwise (well, to a certain degree, as too much exercise can eventually lead to medical problems forcing you in the opposite direction).
Denying that bodybuilders have experience is also nothing I would deny. They are very experienced...in tradition, nothing more. They may add their tidbits or twists to things, but nothing has any reasoning that a rational person (given the time and effort) would not be able to completely debunk. In fact, little if any of it has anything close to what could be called reasoning.
True, there are many bad supplements. Heck, I'm the last person in the world to say otherwise, but don't blame scientists or denounce their use in the exercise physiology field because of bad supplements. If you do that, you don't think there is any use for such things as kinesiology, exercise science, exercise physiology, or anatomy. If you want to look at someone to blame, blame yourself for not learning everything about a substance other then what a company that is selling it says, or believing the hype given by the advertisements and company that depends on the product to make money. If you spend money on supplements and didn't like the results, that is on you and the company that sold them, not the scientific community.
Hey, if you want to denounce science, scientists in general, and the scientific community, I don't see us carrying on this conversation. Oh, and you are wrong, exercise science has existed since the 1940's. Scientists have always been involved, not just with supplements. Scientists also were the ones to develope performance enhancing drugs, and all the great equipment you use in the gym.