1. Sahelian, 1998. 5-HTP, Natures serotonin solution, 1st. Ed., Avery Publishing Group, Inc. Garden City Park, NY.

2. Zmilacher, et.al. 1988. L-5-hydroxytryptophan alone and in combination with a peripherial decarboxylase inhibitor in the treatment of depression. Neuropsychobiology 20(1): 28-35, 1998.

3. Fernstrom, 1983. Role of precursor availability in control of monoamine biosynthesis in brain. Physiol Rev. 99:484-546.

4. van Praag, et al. 1986. Denosologization of biological psychiatry or the specificity of 5-HT disturbances in psychiatric disorders. J. Affective Disord. 13:1-8.

5. Borne, 1994. Serotonin: The neurotransmitter for the nineties. Drug Topics. Oct. 10, p.108.

6. QualTech Laboratories, Inc. 1999. Assay protocol reference; U.S.P. XXIII.

7. Anderson, John. Natural Help for Weight Gain, Migraines, Insomnia, Anxiety and Depression, Alt. Med. (25) 1998.

8. Journal of Neural Transmission 76(1989): 109-17.

9. C. Cangiano et al., "Effects of 5-hydroxytryptophan on eating behavior and adherence to dietary prescriptions in obese adult subjects", Advances in Experimental Medicine and Biology 294 (1991): 591-93.

10. C. Cangiano., "Eating behavior and adherence to dietary prescriptions in obese adult subject treated with 5- hydroxytryptophan," American Journal of Clinical Nutrition 56 (1992): 863-67.

11. ABC Primetime Live Report on 5-HTP. June 17, 1999 Transcript