Phenibut (CAS 1078-21-3) is a high-purity pharmaceutical API recognized for its potent anxiolytic and mood-regulating properties. As a derivative of gamma-aminobutyric acid (GABA), it crosses the blood-brain barrier to modulate GABA-B receptors, delivering calming effects that alleviate anxiety, stress, and restlessness. Its exceptional purity (≥99%) and consistent molecular structure ensure reliable efficacy in pharmaceutical formulations.