[satvikpendem]

Correct, this is why tea and especially ground tea leaves like matcha induce the feeling of focus for longer, they already naturally have higher levels of L-theanine with caffeine.

[FollowingTheDao]

The theanine stimulates the NMDA receptors so it is possible that the glutamate you get from the Caffiene is not enough to stimulate your NMDA receptor. It might be that you are a fast metabolizer of Caffeine.

https://en.wikipedia.org/wiki/NMDA_receptor

[disqard]

While reading, I was wondering about matcha, and then I saw your comment -- which jives with my personal experience too! Thanks for chiming in :)