Not really much science for any of the last 3 products you mentioned. GABA will increase GH in 5 out of 15 people. I'd probalby skip this one. CEE has no info on pubmed.has a ton (I'd use that, but its out of style). , there's one human study that shows it increases exercise . At the end of the day, for me, it comes down to do I need that little increase to get big....?