Hairoids are a type of elixir sold at Slurps and Burps that result in hair growth. It was mentioned that normal hairoids will take approximately a week for the user to have all their hair back. In Keeper of the Lost Cities, Stina (after she drank a balding solution concealed in Lushberry Juice) needed for a fast-working hairoids as she could not go to school looking like "an ogre". Upon her request, Dex made the hairoids more potent, as well as tweaking them to give her a beard.