Dr. Oz

Is this the end of the Dr. Oz's 15 minutes of fame? Will he have to go back to the land of oz? everyone saw what happened to Dr. Phil after his escapade with britney spears. Queen Oprah washed her hands of Dr. Phil. Is she going to have to do it again with Dr. Oz to keep her public image healthy?

Popular TV talk show host Dr. Mehmet Oz is defending his claims of "miracle" weight-loss supplements amid criticism from members of Congress.

Oz testified at a Senate hearing Tuesday on deceptive advertising for over-the-counter diet supplements and products.

For some time, Oz has been accused of false advertising for featuring some questionable dietary and health supplements on "The Dr. Oz Show," his daytime television program with a viewership of more than 12 million.

"I get that you do a lot of good on your show," said Sen. Claire McCaskill, who chairs the Senate's Consumer Protection panel. "But I don't get why you need to say this stuff because you know it's not true."

Oz defended his right to suggest ways to kick-start weight loss by using products that are easily available online but have little data to back up their claims.

He said many of the segments on his show about these product are in the spirit of the message he tries to impart to his viewer each day: "My show is about hope. We've engaged millions in programs - including programs we did with the CDC -- to get folks to realize there are different ways they can rethink their future," he said.

But critics say that's no excuse for making unfounded promises about diet and weight-loss "miracles." McCaskill told "CBS This Morning" that she believes Oz is fueling the diet industry with unscientific claims.

"I've got no problem with celebrity endorsements of any product but I do have a problem when a science-based doctor says something is a miracle when there's no science to back it up," she told CBS News' Nancy Cordes.

McCaskill argues TV programs such as "The Dr. Oz Show" and major websites need to do a better job of weeding out advertisers that make fraudulent claims.

The "Dr. Oz Effect" is known to be the most powerful sales pitch in the diet industry. One mention of a product by him can send sales skyrocketing.