Over 60 percent of Americans buy and take herbal and dietary supplements for all sorts of reasons—to prevent illness (vitamin C), to ease depression (St. Johns wort), to aid weight loss (ephedra), to boost the memory (ginkgo biloba), and even to cure cancer (shark cartilage, bloodroot)—despite the fact that few of these “natural” supplements have been proven to be safe or effective. The vitamin and herbal supplement industry generates over $20 billion a year by selling products that promise to cure or fix, but are produced and marketed essentially without oversight. And while the media has been quick to sensationalize the benefits of supplements, few have taken a hard look at the dangers posed by many of the remedies flooding the market today. Award-winning journalist Dan Hurley breaks the silence for the first time in Natural Causes.