. GABA By itself are unable to cross this barrier unless paired with a dedicated carrier.[v] When niacin is bonded to GABA the molecule conveniently enters the brain. Phenibut HCL is out there in powder and capsule varieties. Powder allows for far more precise dosing but calls for mindful measurement. https://alexisjnmjf.wikiconversation.com/6864495/5_simple_techniques_for_nsi_189