Question: is gbl bad for you?
Answer: Side Effects & Safety Gamma butyrolactone (GBL) is UNSAFE. In the US, it is illegal to manufacture or sell GBL or the related products GHB and butanediol (BD). Use of GBL, or the closely related gamma hydroxybutyrate (GHB) and butanediol (BD), has been linked to deaths and cases of serious side effects.