Researchers reviewed the evidence for recommendations made on 80 episodes each of The Dr. Oz Show and The Doctors. They were able to find at lease a case study or better evidence to support 54% of the total 160 recommendations.
Additionally, for The Dr. Oz Show, evidence supported 46%, contradicted 15%, and was not found for 39% of the total recommendations. For The Doctors recommendations, evidence supported 63%, contradicted 14%, and was not found for 24%. Believable or somewhat believable evidence supported 33% of the recommendations on The Dr. Oz Show and 53% on The Doctors.
Source: British Medical Journal, December 17, 2014