Natural CausesBy: Dan Hurley A riveting work of investigative journalism that charts the rise of the dietary supplement craze and reveals the dangerousand sometimes deadlyside of these highly popular and completely unregulated products. Over 60 percent of Americans buy and take herbal and dietary supplements for all sorts of reasonsto prevent illness (vitamin C), to ease depression (St. Johns wort), to aid weight loss (ephedra), to boost the memory (ginkgo biloba),