>> reporter: america's tv doctor. >> this miracle pill can burn fat fast. >> reporter: dr. oz trusted by millions found him questioned by senators and questionable diet claims. >> why would you say someone that something is a miracle in the bottle. >> i feel comfortable. i don't sell it. these are not for long term use. taking green coffee extract, doubles your weight loss. >> reporter: just weeks after those positive pronouncements, sellers of green coffee been extract started popping up on the internet. one florida company imbedded dr. oz's show, which includes false advertising and paid testimonials an attorney says the charges are misleading and baseless. dr. oz says he has nothing to do with any of the people. he didn't give them permission to use his name or show and makes no money from his sales. the hearing was aimed at problems in the weight loss business which wracks up $40 billion a year. >> you sprinkle on to take the