Doctor Mehmet Oz has legions of fans who tune in to his show daily.
But he also has his share of critics - and some of them are his fellow doctors.
Last week, 10 of them sent a letter to Columbia University, where Oz is vice chair of the Department of Surgery, accusing him of promoting "quack treatments."
Now, Doctor Oz is fighting back. On Thursday, he used about half of his show to defend himself. He joined FOX 5 on Friday to talk more about the special and his response.