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[¦fīv hī¦dräk·sē′trip·tə‚fan]
C11H12N2O3 Minute rods or needlelike crystals; the biological precursor of serotonin.



(also β-5-hydroxyindolyl-3-alanine), an amino acid. Two optically active forms and one racemic form exist for 5-hydroxytryptophan. In animals and man, L-5-hydroxytryptophan is produced as a result of the enzymatic hydroxylation of L-tryptophan during the conversion of L-tryp-tophan into the nervous-system mediator serotonin. When injected parenterally, 5-hydroxytryptophan has a hallucinogenic effect.

References in periodicals archive ?
that did not contain either rosavin or salidroside and one of these was positively identified as 5-hydroxytryptophan, an amino acid commonly used as an antidepressant or an aid for weight loss.
Blood and urine 5-hydroxytryptophan and 5-hydroxytryptamine levels after administration of two 5-hydroxytryptamine precursors in normal man.
president of Geiger and Associates, LLC, and research associate professor in the division of nutrition at the University of Utah, include 5-Hydroxytryptophan (5 HTP), Vitamins B and D, as well as ginkgo biloba and Omega 3.
CravePruTect is a nutritional supplement that reduces cravings by replacing the essential amino acids 5-Hydroxytryptophan (5-HTP), DL-Phenylalanine (DLPA) and L-Tyrosine.
Restoration of 5HT levels by treatment of Tph2-/- mice with its immediate precursor 5-hydroxytryptophan attenuated compulsive and impulsive-aggressive behaviors.
John's wort, hydroxycitric acid, herbal laxatives and diuretics, appetite depressants, and 5-hydroxytryptophan [3].
Within a few weeks of adding the 5-hydroxytryptophan treatment, symptoms in both twins had improved and these improvements were sustained to at least 4 months, when the report was written.
The others were also found to contain yohambine in combination with ephedra, I-trytophan and 5-Hydroxytryptophan (5-HTP).
Tryptophan is metabolized into 5-hydroxytryptophan (5-HTP), which is metabolized into serotonin.
Tryptophan (SOR: A, 1 systematic review) and 5-hydroxytryptophan (5-HTP) (SOR: A, 1 systematic review) have demonstrated superiority over placebo in alleviating symptoms of depression, but concerns exist about their safety.
The specific substances cited by youth as useful for preloading and post-loading included 5-hydroxytryptophan (5-HTP), selective serotonin reuptake inhibitors (SSRIs), ginko biloba, St.
25 mg/day intravenously), sodium valproate (2200 mg/day intravenously) and 5-hydroxytryptophan (1200 mg/day p.
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