Girls, if you want more information and unbiaised articles with scientific sound backgrounds, try
www.Quackwatch.com, it's an independent (Canadian) site that questions quackery, questionable advertisement, products and malpractice and tries to be fair on scientific grounds. It's got lots of information and articles on these kinds (and other kinds) of health products, and although you might not agree with some of the themes and opinions, it's a service to the public and not a secret ad to make you buy anything. Worth a try and have fun (also look at the cheers and jeers section, very funny), greetings from Greece!