[Good question. Jesse's face twists up in consideration.]

Never tried it. I mean, I can't change stuff that isn't hurting somebody. If you cut your hair, I can't grow it back. But if you got infected with, like, a zombie virus, I could turn you normal. And I can bring somebody back from the dead, but it's way more complicated than what I'm doing here. There's a big cost for that, morally-speaking.