The final word Guidebook to GBL: Rewards, Utilizes, and Basic safety Tips ???? ???? What Is GBL? GBL (Gamma-Butyrolactone) can be a chemical compound greatly used in industrial and pharmaceutical apps. It's really a precursor to GHB (Gamma-Hydroxybutyrate), a substance recognized for its sedative and euphoric effects. GBL is often present in clean