Ive tried both faa and regular phjenibut. To be honest, i used daily roughly 3-9 gram and had to cold turkle4y after like a month, it was like an acute mild benzo w/d habit. Id have to advocate that although it did suck arse, it was not bad excfept the first dose isnt acfhiievable in effect (subsequent days). Other good products too. (7/16/19)