(This is not a slam on cold brew. If that's what you like, more power to you. It's great for a make-now-drink-later approach.)
There is a minor complication in which if the brain is in a very stimulated state, then theanine can add to the stimulation, but that has happened to me only once in hundreds of times of my using theanine at bed time, and is extremely unlikely to recur now that I know about the complication.
Also, coffee does not contain any theanine.
Energy drinks like Monster add it in to prevent the "jittery" feeling that is associated with coffee. Teas like assam and mate have l-theanine, but I'm not sure about cold brew - maybe it allows for more extraction with the longer brew time?
Some nootropic-minded folks supplement with powdered l-theanine for this reason.
Interestingly, cold brew makes me a bit anxious but doesn't really satisfy the caffeine craving the way a traditional cup of coffee does.
YMMV I guess
Same, it gives me all the physical anxiety of coffee without any of the mental benefits - I don't understand how it's taken such a large share of coffee drinkers by storm!
In fact, cold press is pretty much the only outlier here. Caffeine is highly soluble in water, and the low temperature is the only thing slowing the extraction process down in a cold brew. In all of the other examples, the caffeine is mostly (though admittedly not entirely) extracted before most of the flavors are.
“Espresso and French press both tend to extract higher concentrations of tryptamides,” Sebastian says. “Meanwhile, tryptamide concentrations in filter coffee are usually quite low because they are absorbed by the paper filter.
“However, tryptamides are only some of the compounds which contribute to the increased secretion of gastric acid,” he adds. “In our research, we are also analysing the effect of chlorogenic acids [on the stomach], but more evidence needs to be gathered.”
https://perfectdailygrind.com/2023/02/can-too-much-coffee-ca...