Gamma Hydroxybutyrate Effects Gamma Butyrolactone Uses Gamma Butyrolactone (GBL) Gamma butyrolactone (GBL) is a chemical in cleaning solutions and nail polish. In the body, GBL is converted to gamma-hydroxybutyrate (GHB), a date-rape drug. When the body converts GBL into GHB, it can turn off some functions of the nervous system. Despite serious safety concerns, people…