Dr. Joel Bervell, a physician known to his hundreds of thousands of followers on social media as the " Medical Mythbuster ," has built a reputation for debunking false health claims online.

Earlier this year, some of those followers alerted him to a video on another account featuring a man who looked exactly like him. The face was his. The voice was not.

"I just felt mostly scared," Bervell told CBS News. "It looked like me. It didn't sound like me... but it was promoting a product that I'd never promoted in the past, in a voice that wasn't mine."

It was a deepfake – one example of content that features fabricated medical professionals and is reaching a growing audience, according to cybersecurity experts. The video with Bervell's likeness appeared on multiple platforms – TikTok, Inst

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