[bagful]

For my biology, L-theanine (200 mg) rounds out caffeine by stamping out the anxiety-inducing effect. By itself it just gives me a headache sometimes.

[hisnameisjimmy]

I don't even notice it without caffeine (coffee), but it has transformed coffee for me from something I had to be super careful with to something that is incredibly enjoyable and productivity-inducing without feeling sick and insane.

[naruhodo]

Absolutely. This is what I came here to say.

Coffee gives me the anxious jitters. L-theanine turns that into focused alertness. I have reduced my coffee intake overall and supplemented my caffeine intake with a small glass of energy drink each day (not a whole can).

My daily supplements intake includes L-theanine (the brand depicted by the video thumbnail in the linked post), St Johns Wort and an IBS support supplement (NutraLife Gut Relief) that contains 2000mg of glutamine per dose.

All of that really helps with anxiety and depression. If I want extra energy, throw in some L-carnitine.

[sheefrex]

Indeed, one of the studies cited supports this view.