GHB is lethal in overdose, should absolutely not be combined with any other depressants, but is actually remarkably, incredibly safe at normal doses, so much so that it's almost the paragon of what it is for a drug not to be toxic. Shammy is right, GBL is metabolised in vivo to GHB, and the ratio you give is about right, 1ml=1.2 or 1.4g or something like that. Powder GHB is harder to produce than the solution, but is obviously preferable, having been more competently produced and being easier to dose and transport. GHB is super good, feels like euphoric alcohol. However, as MDB says, dosing is a fine line. It's not there, subtle, have a little more, still not doing anything, maybe like being a little drunk, tad more, super goodness gracious euphoric wowzas, bit more, spazzy coma. If you'll be doing it, warn others of this effect, it can easily induce unrousable coma-like sleep that, though harmless, looks to both bystanders and medical professionals like a life-threatening overdose. I was in mid-conversation with a friend who suddenly announced that he was "too bad for my off-brand bullshit", asked me "do I look like a battyman?" in a Jamaican accent, then flopped over, unconscious, drooling over himself. I also once passed out with my chopper in my missus, she wasn't impressed. Oh yeah, great for sex, disinhibiting and euphoric and produces incredible huge hard erections, but obviously, don't pass out with your weapon inside a lady. I've done the science, it's not well recieved.