- Mehmet Oz's controversial health claims, from the HCG diet to green coffee extract | Once called “America’s Doctor,” Donald Trump’s pick to head Medicare is now more known for dubious promotion of supplements and hormones unsupported by scientific evidence. https://www.nbcnews.com/health/health-news/dr-mehmet-oz-health-claims-controversial-medicare-trump-rcna181085 28 comments health