I take 400mg before interviews when I'm job hunting. Unlike benzodiazepines, it doesn't seem to affect my problem solving ability at all. The effect is pretty mild compared to stronger anti-anxiety medication, but for me it seems to take my anxiety down a couple notches.

During a regular onsite interview, without l-theanine I might have some heart racing, and I might not be able to focus well enough to even understand what an interviewer is asking me. With l-theanine, the anxiety is still there but I can at least understand the problems I'm given.