Watch Is it Real online: Episode 10 Vampires

With the 1897 publication of Bram Stoker's novel Dracula, vampires entered mainstream consciousness. Prior to that, however, these supposedly undead blood-drinkers had been alive in folklore. For centuries, frightened people have been digging up their dead and destroying their hearts in an effort to kill these creatures. In fact, this activity still persists in modern-day Romania. But, is there a legitimate medical condition that could explain a person's need to consume human blood? Don Henrie, a man who identifies as a vampire, agrees to medical tests to see if doctors can pinpoint a physical reason for his blood need.

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