Tried L-Theanine, 200MG Capsules, cant tell if it helps reduce anxiety or not. I never took it consistantly (ala every-day), only took it when some anxiety provoking situation was coming up. In my opinion I was getting a placebo effect off of it, but not sure. It did reduce the anxiety, but I think I was simply tricking myself into thinking it was 'really reducing my anxiety' (which in turn reduced my anxiety).
I also had a bottle of 750MG GABA Capsules and decided to do a dual dose Gaba 750mg & 200mg L-Theanine during one family get together and it mellowed me out, kind of felt 'zoned out' in a way. However after about 1-3 hours after taking it, I get a minor headache-feeling (more like a feeling of pressure) in the front of my head.
I tested it on two other occasions afterwards and the same result, kind of zones me out (or 'numbs' me per say), still have anxiety and I can feel it, but it doesnt have a particular impact as it would normally. Dont like the pressure feeling in my head, though, that concerns me.