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I've heard that the L-Theanine [1] in green tea is responsible for a calmer caffeine effect. Although I haven't tried it, I've heard that you can get the same results by taking a supplement before your morning coffee.

1. https://en.m.wikipedia.org/wiki/Theanine

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I second this, and have used it for years with caffeine for this exact reason. By itself it also has an anti-anxiolytic and calming effect, and has been used to treat ADHD as well.

If you want to try it out, make sure you get Suntheanine. A dose that works for many is twice the theanine than caffeine, but YMMV.

I use L-Theanine and straight caffeine pills (100mg) as my preferred source of caffeine, it works very well. You get the alertness of caffeine without the annoying jittery feeling side effects.

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