That's good, it might contribute to why I feel more mentally balanced when I stick to a green tea and high vegetable diet since that's apparently a rich source of l-theanine and GABA. It's hard to separate from the other benefits.

I don't like our culture of having a magic pill for everything, when there are simpler (less processed, less packaging, much cheaper) things to try first that promote better health overall. But green tea, sweet potatoes and oily fish aren't sexy marketing propositions that can be marked up x percent.