While holy water doesn't have any special effect on vampires, one deadly herb does. What can protect humans from vampires?
Answer Vervain
Vervain is a deadly herb for vampires. If a vampire makes physical contact with vervain in any form, it will burn them. On the other hand, if a human holds vervain somewhere on their body, the human is protected from vampire compulsion.
Asked by Vasilii Kulev · Last updated 5 years ago · 730 views · SOURCE