Hoi Timo,
GBL and 1.4 BD needs to be metabolized by the liver and or stomach acid in order to become GHB.
1.4 BD is toxic for the liver, also the 1.4 itselve goes into the bloodstream and has more of an alcohol numbing effect compared to the high of GHB and GBL. Stay away at all cost from 1.4!
GBL is said not to be toxic, but being an industrial solvent you dont want to down a pure cap of this shit as it will irritate your stomach and make you puke, you need to wash it down with lots of fruitjuice or something....
Also I definately feel the GHB gives you a much cleaner high than GBL (maybe the GBL is partly metabolized into intermediate products with psychoactive effects or the peak buildup is less steep i dont know)
Another problem with GBL compared to GHB is that i passed out twice on GBL and not on G because of the time-release effect of GBL.
Depending on mood, energy levels and amount of food in stomach the conversion of GBL into GHB can be very quick or very slow, which cause it to have a lot of inpredictable ways of hitting you in a good or bad way!!!
The times I fucked up the conversion was slow and I downed another dose. Than it hit me all at once! The best is to have GHB, but i know, the GBL is cheap and still can be ordered from the internet, but since you are from Amsterdam and I live near Amsterdam it shouldnt be a problem to (PM me).....