Many people have said that GNC's GABA is filled with other shit. This what a close friend of mine is considering buying. He is inflicted with Asperger's syndrome, and has found relief by following a specific diet that limits his intake of certain things commonly used as fillers. The bottle lists 750mg of GABA, while under "other ingreidiants" it lists only Gelatin. Which I assume is used in the pill casing. I figured I'd ask the good people here... for obvious reasons. If it's pure enough for your uses, it should be pure enough for him. DO NOT POST LINKS TO COMMERCIAL SITES.