I think a safer/more healthy alternative to benzos and z-drugs has been identified now, anyway. It's still quite weak at the moment, but this arena seems to have potential.
The diazepam-like profile observed in the elevated plus-maze paradigm and in the conditioned defensive burying experiment revealed an anxiolytic-like activity of the αs1-casein tryptic hydrolysate consistent with its binding to the BDZ site of the GABAA receptor. Only one peptide of the tryptic hydrolysate, the αs1-CN-(f91-100), displaced [methyl-3H] flunitrazepam from GABAA receptor. The synthetic peptide displayed the same activity, confirming that α-casozepine carries the total anxiolytic activity.1
A peptide having an original anxiolytic activity was identified in an otsl casein tryptic hydrolysate. It corresponds to fragment 91-100 and was named α-casozepin. Guesdon et al also showed that this same tryptic hydrolysate of casein including peptide 91-100 improves sleep in rats subjected to chronic stress. The structure of this decapeptide was studied by two dimensional 1H NMR. The sequence contained between the glycine 93 and leucine 99 residues adopts in a micellar medium, a 310 helical structure initiated and terminated by an α helix The lateral chains of the hydrophobic residues are located on the same face of the helix, while the lateral chains of the hydrophilic residues are located on the other face, thereby conferring an amphiphilic character on the peptide and enabling it to interact with membranes. The ionic interactions betWeen the guanidinium group of the arginine 100 residue and the carboxylic groups of the glutamic acid 96 and arginine 100 residues show the critical role of the carboxy-terminal arginine residue in the stabilization of the helical structure. In such a structure,the aromatic rings of the two tyrosine residues in position 91 and 94 are oriented so that the distance between their center (0.56 nm on average) is comparable to the distance observed between the centers of the aromatic rings of nitrazepam, a benzodiazepine known for its anxiolytic properties. The substitution of the arginine 100 residue with an alanine residue significantly decreases the helicity of the decapeptide and results in a decrease in the afiinity of this peptide for the benzodiazepine site of the GABAA receptor by a factor of 300,000.2
So a basic preparation involving this milk derived benzo analogue is available over the counter as Lactium or as Boots own brand "milk protein hydrolysate".
Don't knock it unless you've tried it!
It could use improvement, though. I messaged some Chinese chem suppliers, but they only seeem interested in synthing the novel opiate milk derived peptides? ...Weird.
1http://www.lactiumusa.com/pdf/restudy/characterization-of-alpha.pdf
2http://www.google.co.uk/patents/US20110312892?
Sorry to go off topic.