Phenibut made me feel horrible. I could experiment more but I did move up in dose and it wasn't a nice experience so I just left it.
GABA on the other hand is very interesting and I experimented with that many years ago. It gave me some of the craziness dreams ever. It would make me feel very drowsy so you have to be careful with the dose when taking it through the day. I would use it at a higher dose pre bed.
Gamma-aminobutyric acid (GABA) is a non-proteinogenic amino acid and is the main inhibitory neurotransmitter in the mammalian brain. GABA's stress-reducing, and sleep enhancing effects have been established. However, although several human clinical trials ...
www.ncbi.nlm.nih.gov