staycalm said:http://psy.psychiatryonline.org/cgi/content/full/42/1/83
What specifically are these "opioid-like substances" they are referring to? 8)
I did some more digging and came up with the following:
http://www.bodybuilding.com/fun/par3.htm (at least it lists its reference for the claim..)GHB has been found to increase brain levels of the endogenous opiods, dynorphin and beta-endorphin (25).
However, I've read conflicting reports on whether these "opioid-like substances" play any significant role in the effects elicited by GHB.