"Caffeine and theanine exert opposite effects on attention"

I didn’t read the study, but this might interest people.

Tea is perceived as more relaxing than coffee, even though both contain caffeine. L-theanine in tea may account for the difference. Consumed together, caffeine and theanine exert similar cognitive effects to that of caffeine alone, but exert opposite effects on arousal, in that caffeine accentuates and theanine mitigates physiological and felt stress responses. We evaluated whether caffeine and theanine influenced cognition under emotional arousal.

Hmm so caffeine could help but if paired with theanine this is counter-acted?

I only drink water anyway lol, but sound interesting