Phenibut HCL  CAS Number 1078-21-3 Molar Mass 179.219 g·mol−1 Chemical Formula C10H13NO2 IUPAC Name 4-Amino-3-phenylbutanoic acid What is Phenibut HCl? Phenibut HCl is a tranquilizer and nootropic drug initially synthesized in Russia as a non-addictive alternative to psychoactive drugs like alcohol. The compound mimics the brain chemical gamma-aminobutyric acid (GABA) to reduce anxiety, improve sleep, … Continue reading Phenibut HCl Powder Advantages, dosage, and adverse effects (2025)