Cocoa polyphenols are great for your health. Unfortunately, you need to consume a lot of them to get their benefits. For example, cognitive benefits only begin to appear at intakes of about 2 grams of cocoa polyphenols per day. Not stated in this article is the darker the chocolate product, the higher the levels of cadmium in that chocolate. In fact, a number of dark chocolate makers are being sued in the state of California for unsafe levels of cadmium in their products.