I appreciate the high agency and citizen science here. However, I think 1) theanine should not be isolated but ingested in context (via a nice pot of tea) 2) there should be a little bit more respect for statistical methods.
While those two points appear to be contradictory (the first appears to inject noise/variability, the second is intended to reduce noise), I believe they each produce a superior result. Regarding the first point (drinking tea instead of ingesting a capsule), theanine does not operate in isolation, but instead interacts significantly with other compounds. Regarding the second point, statistics are the lifeblood of these kinds of trials, what is the purpose of a series of trials without a correct analysis? (I believe it should be standard to devote a huge chunk of time to getting the math right during the analysis, even though it is hard/unintuitive.)