The final word Guideline to GBL: Gains, Works by using, and Security Recommendations ???? ???? Precisely what is GBL? GBL (Gamma-Butyrolactone) is usually a chemical compound broadly Employed in industrial and pharmaceutical purposes. It's a precursor to GHB (Gamma-Hydroxybutyrate), a material noted for its sedative and euphoric effects. GBL is co