I googled on this, and found a good bit of chat about it but not too much science. It was a quick look though. If it helps that would be nicer seeming than other drugs. I found almost nothing on using this as a test for adhd, but that doesn't mean it shouldn't be. I would love to see/find a study on it.
A cap might be overdoing it! 2 cups of 'american coffee' (too weak 4 me) seems recommended- by some, and you have to figure on weight being a factor...I'm not saying try again, but there is some info on dosage on the web too.
