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| | Hydroxy Tryptophan - Herbal Reference Guide |
 | | Hines Burnham, et al, Drug Facts and Comparisons 2000, Facts and Comparisons; 2000. |
 | | John H. Juhl, Fibromyalgia and the Serotonin Pathway, Alternative Medicine Review |
 | | Steven Meyers, Use of Neurotransmitter Precursors for Treatment of Depression, Alternative Medicine Review |
| www.superbherbs.com /HydroxyTryptophan.html (626 words) |
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