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The name theanine usually refers to the enantiomer L-theanine, which is the form found in tea leaves from which it is extracted as a powder. [4] [6] The right-handed enantiomer, D-theanine, is less-studied. Theanine is sold as a dietary supplement and is considered to be safe at doses up to 250 milligrams (mg) by the US Food and Drug ...
The world's primary source of caffeine is the coffee "bean" (the seed of the coffee plant), from which coffee is brewed. Caffeine content in coffee varies widely depending on the type of coffee bean and the method of preparation used; [ 240 ] even beans within a given bush can show variations in concentration.
“Have a demanding task at work late in the day but don't want coffee jitters? ... L-theanine supplements could interact with some anti-anxiety, blood-pressure, and sleep meds. Side effects ...
A review of 49 human trials from the journal of Current Pharmaceutical Design suggests that phytochemicals like L-theanine and caffeine found in matcha ... The best heated coffee mugs of 2025.
The chemical complexity of coffee is emerging, especially due to observed physiological effects which cannot be related only to the presence of caffeine. Moreover, coffee contains an exceptionally substantial amount of antioxidants such as chlorogenic acids, hydroxycinnamic acids, caffeine and Maillard reaction products, such as melanoidins. [3]
In addition to L-theanine and lemon balm, these drinks contain guayusa, which has antioxidant and anti-inflammatory properties. Guayusa is also the source of caffeine in this drink. Guayusa is ...
Relaxation drinks can be considered the anti-energy drink and have found a niche alongside energy drinks. Some relaxation shots, particularly those with L-theanine, have been known to be used alongside coffee as a way to counter some of the jittery-feeling caffeine can produce.
The bottom line: While L-theanine may have the potential to enhance your life and benefit your health in certain areas, “always discuss your individual potential risks and benefits of starting a ...
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