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L-theanine and caffeine are both readily available, giving you multiple options to try this combination out. Coffee is the most common choice for caffeine, giving you access to the various health benefits that coffee offers. A cup of coffee often contains 100 mg of caffeine – although brewing methods influence this dramatically.
The first is to take a theanine capsule alongside your coffee. A single 100mg pill or two of them to reach your 200mg for a cup of coffee works just fine. Theanine comes in capsule form from many health foods and supplement stores. The other option is to add your theanine directly to your cup of coffee.
However, studies have been performed using caffeine and theanine that are isolated from tea, to remove other compounds that might make it more difficult to isolate the effects. In one study, 50mg of caffeine is used with and without 100mg of theanine alongside it, in a test of cognition and mood.
Paired with caffeine, L-theanine may help increase focus and attention. A small study found that a combination of L-theanine (97 milligrams, or mg) and caffeine (40 mg) helped a group of young adults focus better during demanding tasks. A typical cup of coffee contains 95 mg of caffeine ( 4 , 5 ).
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