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.