I use a concentrated cayenne liquid in the garden for pest control. "IF" you think a good ripe habanero is hot, this liquid I use makes the ripe habanero seem like a frozen ice cube. I am serious. 1 drop seems like it would be leathal. "IF" a pure drop was to find its way into a human mouth, I fear it would cause death out of the extreme fear it would cause; yet, its just the friendly pepper under extreme concentration and the best product on earth to case every bug from the garden, but sadly very expensive, a small bottle cost about $100 wholesale. Someday I want to use a needle and give my fruit trees a shot with this, I have this theory that it may make the tree disease/parasite proof.