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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 ?
Double-blind study of 5-hydroxytryptophan versus placebo in the treatment of primary fibromyalgia syndrome.
levodopa and 5-hydroxytryptophan, may be necessary to boost central nervous system substrate levels for catecholamine and serotonin synthesis, respectively
com/research/7cvbrm/5hydroxytryptopha) has announced the addition of the "Global 5-Hydroxytryptophan (5-HTP) Market for Food and Beverage, Dietary Supplements, Medical and Other Applications - Forecasts to 2019" report to their offering.
A typical capsule may contain the following ingredients; 5-hydroxytryptophan, dicalcium phosphate, microcrystalline cellulose, capsule shell (gelatin), magnesium oxide, silicon dioxide, magnesium stearate, stearic acid, and vitamin [B.
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.
The effect of intraluminal application of 5-hydroxytryptamine and 5-hydroxytryptophan on peristalsis, the local production of 5-hydroxytryptamine and its release in relation to intraluminal pressure and propulsive activity.
Restoration of 5HT levels by treatment of Tph2-/- mice with its immediate precursor 5-hydroxytryptophan attenuated compulsive and impulsive-aggressive behaviors.
Treatment with 5-hydroxytryptophan improved both patients' symptoms, with no significant side effects.
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).
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