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. Author manuscript; available in PMC: 2013 Mar 1.
Published in final edited form as: Psychoneuroendocrinology. 2011 Aug 5;37(3):372–382. doi: 10.1016/j.psyneuen.2011.07.007

FIGURE 1. Change in Free Tryptophan Levels During Active and Sham Depletion.

FIGURE 1

Free plasma tryptophan levels decreased by 64% to 90% from pre to 6 hours pos-ingestion of an amino acid mixture without tryptophan. Free plasma tryptophan levels decreased between 5% and 26% on sham depletion test days.