Phenibut is a supplement that has powerful relaxation, sleep-inducing, and mood-enhancing effects. It is classified as a GABA agonist. It has a calming effect on brain activity. Wonder what GABA is? It is a neurotransmitter in the central nervous system. Phenibut was first synthesized by the Russians during the 1960s. It is been used to relieve tension, anxiety and fear. Today, it is marketed for medical use as well as sold as herbal supplement. Along with treating anxiety, it is…