It's swiftly transformed into GHB by lactonase enzymes present in the blood.[five] GBL is much more lipophilic (Fats soluble) than GHB, and so is absorbed quicker and has larger bioavailability; paradoxically This will signify that GBL contains a faster onset of consequences than GHB alone, even though It's a prodrug. https://bestchemshop.com/product/gbl-gamma-butyrolactone-lab-grade-99/