The last word Tutorial to GBL: Advantages, Utilizes, and Safety Guidelines ???? ???? What's GBL? GBL (Gamma-Butyrolactone) is often a chemical compound greatly used in industrial and pharmaceutical purposes. It's a precursor to GHB (Gamma-Hydroxybutyrate), a compound noted for its sedative and euphoric effects. GBL is commonly found in cleansing a