The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
The reason why a lot of energy drinks, and sodas, and, frankly, now coffee brands are including theanine in the coffee, or energy drink, or soda is because it tends to have a mild anxiety-reducing effect. And it reduces the jitters that caffeine creates.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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So for instance, a lot of energy drinks now contain L-tyrosine, which is a precursor to dopamine. A lot of them will contain L-theanine.
Interestingly, theanine is now being introduced to a lot of energy drinks in order to take away the jitters that are associated with drinking too much caffeine or with some other things that are in the energy drinks.