I bought some a while ago and wasn't too impressed. I worked my way up to 10 grams and was nauseus beyond belief. I didn't really get any benefits out of it. I heard that gaba cant pass through the blood/brain barrier like ghb so its effects are pretty shitty.
When I take 1g of GABA atonce on an empty stomach, after about 15-45 min I get flushings similar (Niacin Like) but more so, I can hardly breath for about half an hour.