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Re:A newly discovered tea plant is caffeine-free by PhasmaFelis on Thursday December 13, 2018 @09:43AM (#18672584)
Is there a reason to believe the L-Theanine was a factor there? What you describe sounds exactly like the normal effects of caffeine.
Re:A newly discovered tea plant is caffeine-free by com2kid on Thursday December 13, 2018 @12:28PM (#18674119)
L-Theanine makes caffeine's effects last much longer.

As gp said, 1 espresso, 6 hours.

For me it also cuts down the side effects, all around a very useful substance.