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Caffeine can be effectively used instead of adderall for concentration
(www.wyomingpublicmedia.org)
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Similar experience here, I drink decaf espresso and more than 1 cup even of decaf in the morning can leave me jittery and clammy for most of the day. So I try to limit it to 1 per day and skip days as well to ward off headaches. I've tried adding L-theanine on occasion (which for some seems to steer the effects of coffee more towards tea) and it might help some for me but not by much.
L-theanine was such a disappointment for me. I'd heard it was supposed to take the jitters out of coffee, but instead I end up jittery, drowsy, and spacey all at the same time.