One thing I found out about the "Oprah" name on things. The Acai Berry was mentioned when Dr. Oz was on the program. He mentioned that it was being considered in cancer research. That was it. Bing, bang, boom. Once sentence. BUT that is all that needs to be said and a company can legitimately state "As seen on Oprah".
The diet itself wasn't promoted but only mentioned. There were no endorsements, nor did Oprah say "I use this", yada yada...
So it's buyer beware on these claims you see on the net. When it states "As seen on ...", that in no way means that it was endorsed or promoted. It could have just been a commercial that played on a new program and a company can legally say "As seen on..." Same with using celebrity endorsement. If a celebrity says ' ABC soap ' was in her hotel room then that ABC company can say "She" uses our product and looks 10 years younger. Never did the celebrity say she used the soap and never were there photos of a before soap or after soap to see the '10 years younger', but a company can legally state such claims. Yes, to we the consumers, this sounds bogus. However, living in the beltway of D.C. where legal eagles abound, one learns to see between the legal lines of a disclaimer.
My dr said that the Acai berry is great as a fruit and supplement but would be wary of a pill form. Usually when things like berries, etc.. are reduced to pill form you lose the benefits because the active ingredients are diluted with the fillers used in capsule manufacturing. She recommended using the juice or extract.
Hope this might help when you see "Oprah" in a tagline for a product, be very wary. I even saw a shampoo that had Oprah's name linked to it and it was a shampoo for babies and those with fine hair... which obviously doesn't apply to Oprah.