Are those supplements doing anything?

Like most people my age, I take a variety of dietary supplements (in my case, they include a men's multivitamin, extra vitamin D, and fish oil).

The very neat Information is Beautiful website has a interesting graphic illustrating the Scientific Evidence for Popular Dietary Supplements.  A lot of claims are made about many supplements, but in some cases, scientific evidence for those claims is sorely lacking.  You can dig into the data used to generate this image by following links at the bottom of the page.

I do like green tea (I should drink more of it) and see that cocoa looks pretty good (I suppose I could manage to choke down a little more dark chocolate for purely medicinal reasons).