Also found in: Thesaurus, Medical, Acronyms, Encyclopedia, Wikipedia.


The biologically active form of the amino acid tryptophan. It is used sold as a dietary supplement for use as a sleep aid and mood enhancer.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Calm Down Kitty and Maxin' Relaxin' Rover contain hemp with naturally occurring CBD and L-Tryptophan to help maintain emotional balance.
L-tryptophan is one of the precursors to serotonin production.
The outbreak was ultimately attributed to a contaminated L-tryptophan amino acid supplement made in Japan.
Calming Aid with Melatonin: Formulated with melatonin and L-tryptophan, the product is designed to act like a dog "chill pill."
Melatonin is found naturally in some food sources, including tart cherries, and is a derivative of L-tryptophan, an amino acid plentiful in poultry, eggs, and shrimp.
* Insomnia: L-tryptophan, 5-HTP, glycine, melatonin
Several over-the-counter dietary supplements have also been shown to increase serotonin and effectively treat symptoms of depression, including SAM-e, 5-HTP, L-tryptophan, and St.
Also, you could discuss using an L-Tryptophan supplement with your vet.
The present study was focused on determining the effect of L-tryptophan on quality of sperm and its fertilizing capacity in endangered trout Salmo coruhensis, Anatolian trout Salmo rizeensis and rainbow trout Oncorhynchus mykiss.
"For example, a high-protein snack several hours before bed can provide the L-tryptophan needed for your melatonin and serotonin production," says Pippa Campbell, nutrition & weight loss coach (pippacampbellhealth.
The biomolecule L-tryptophan ([C.sub.11][H.sub.12][N.sub.2][O.sub.2] (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid) is soluble in water and does not require the use of nonaqueous solvents that are difficult to remove during crystalline growth, so it can be introduced by adding in situ aqueous solution to the growth process of a PbS matrix.