Be careful trying Theanine, for my son it caused him to be groggy(sp) and grumpy - you know like when a child is overly tired. He may have been calmer after taking it but like a tired child he was not able to function emotionally. Someone else wrote on this site that for ADD/ADHD stimulants (like caffine) usually work better than calming remedies (such as theanine) and that is what I have found as well. Green and Black tea both have theanine in them. I wonder, since they both contain caffine too, if it wouldn't be better to try that instead of the theanine supplement.