Phenibut is used for anxiety, fear, trouble sleeping (insomnia), tension, stress, fatigue, post-traumatic stress disorder (PTSD), depression, alcoholism, and irregular heartbeat. It is also used to improve memory, learning, and thinking. https://oysterhill8.werite.net/post/2021/09/25/Pre-Workout-Supplement-The-Best-Muscle-Building-Supplement-Available