I have referred to "Sense About Science" in the past and I think they are a wonderful (and necessary, unfortunately) organization that is dedicated to showing what the science really says about issues that are often misrepresented.
Each year they put out a report that reviews the health claims that are made by celebrities and other people in the public eye.
This year they tackle issues ranging from magnetic bracelets and Power Balance bands to "detox" diets and homeopathy.
You can download the PDF report or read some of the news coverage here and here.
(They tackle the "full of chemicals" claim that I, often, have to counter - Nothing is chemical free: everything is made of chemicals.)