GHB was biggest in the 70s and 80s, before it was banned. It used to be sold in health stores and every bodybuilding magazine. It got banned for obvious reasons of addiction risk and dose escalation.
I'm unlikely to be fully objective here since one of my best bodybuilding friends started using it for the enhanced nighttime GH secretion, eventually became an addict, then choked to death one night on his own vomit while unconscious from his regular nighttime dose.
Alcohol inhibits GH release (and pulsatility) hence why it will tend to block the effects of GH releasers or pulsatility enhancers.
Honestly, there's a dozen cheap, easy to buy peptides from peptide websites all over the clearnet now that'll do the job GHB/GBL used to do but without the risks of addiction and death. Go with them.