[extr]

Just throwing my own anecdotal experience on to the pile: L-Theanine is very effective for me when taken with caffeine in a 2-1 ratio. As another commenter said, it "smooths out" the jitteriness of caffeine, and this scales up to 200-300mg of caffeine (400mg-600mg of L-Theanine). The focus it provides is the closest legal alternative to adderall that I've found.

If taken alone, it's also pretty good at providing a general reduction in anxiety. I was travelling internationally one time with a co-worker who had a very low grade anxiety attack. Due to the circumstances our options for getting him medication or seeing an actual doctor were limited. I offered him some L-Theanine and he LOVED it, he said it calmed him down just enough the rest of the trip that he wasn't concerned with having another attack. Obviously, this isn't medical advice and ideally he would have seen an actual doctor, but in this case it was really effective. I will say that taking it without caffeine comes with a bit of sleepyness. Definitely a potent combo when taken with Melatonin and a lot of OTC sleep aids will combine the two.