Buy 3 liters of Gamma Butyrolactone in 2026 What is gamma-butyrolactone? Gamma-butyrolactone (GBL) is a colorless organic compound used as a solvent in many chemical processes. It is also known as a precursor to gamma-hydroxybutyric acid ( GHE ), a substance used in both industrial and recreational applications. The lethal dose of GBL is an importa