Caffeine - Cited Sources
[1] http://www.sciencedirect.com/science/article/pii/S0031938407002284
[2] http://ajcn.nutrition.org/content/70/6/1040.full
[3] http://www.ncbi.nlm.nih.gov/pubmed/18006208
[4] http://www.sciencenews.org/view/generic/id/8965/description/Distracted_Tea_might_help_your_focus
[7] http://www.ncbi.nlm.nih.gov/pubmed/18834663
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