I've read up on tryptophan and serotonin in the brain, but in relation the central fatigue, not other things.. I'm not sure if the research supports that eating more of it will increase serotonin levels, though..
Tryptophan is the precusor for serotonin, but how eating it affects the levels of tryptophan in the brain and if it's significant or not is another matter..
EDIT: also, if it is to work (not saying it does) you'd have to restrict your intake of BCAAs when you take the supplement, as BCAAs "compete" with tryptophan for entry into the brain. I found a review on tryptophan and serotonin, but I don't think I have time to read it now (I'm going to rent a movie soon :P)
Maybe someone who has read up on this before will chime in. Otherwise, I'll probably read up on it as it caught my intrest.
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