Damon takes a deeper drink from the glass in front of him. "24 hours if you ingest it. If you wear it, it's not going to wear off," he says, but it won't be in his blood that way, which doesn't always matter. Damon has built up a resistance to vervain over time at least when it comes to drinking it in someone's blood.

It'll just keep him from being compelled, which is the biggest reason to take vervain in the first place. Compulsion is powerful. It can force people to tell the truth. It can make them forget. It can make them feel a certain way about something, anything.

"...never seen anyone wear a crown of it before."

He smirks at the visual.