Kevin comments on Coffee: When it helps, when it hurts - Less Wrong
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Tea has other alkaloids beyond caffeine. Probably the most notable is theanine, which is relaxing. http://en.wikipedia.org/wiki/Theanine
Kevin, You got it. Tea has L-Theanine in it, which keeps you from getting the coffee jitters. I just got myself some L-Theanine pills to test out how it works on my concentration.
I take some Theanine pills every now and then (Theanine Serene). I tried them originally to help with occasional bouts of insomnia. They didn't help with that at all, but they definitely do relax me in the rare moments I get a bit stressed from overworking.
Wonderful stuff, theanine. I converted to green tea extract as my preferred caffeine source once I learned green tea is a good source. (Then I bought bulk theanine powder and explicitly chose my dose!)