If I could play devil's advocate for a minute here...I do not think all supplements are harmful. If you use them as directed they can be helpful. (And most will tell you up front that you should consult your physician before taking them if you have health issues). I know of a lot of people who have reaped the benefits of supplements (for example, blood sugar formula for diabetics). Though I would never replace doctor-prescribed medication with supplements, I would not have a problem supplement-ing my prescription with something perhaps a bit more natural. That being said, I agree that there is no magic pill that is a cure-all for everyone's health problems and that if we would all eat healthier and exercise perhaps we would not need to supplement our diets with pills.
Just wanted to provide a different perspective on this topic.