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L-tryptophan

 
Dictionary: L-tryp·to·phan   (ĕl'trĭp'tə-făn') pronunciation

n.
The biologically active form of the amino acid tryptophan, which is capable of being incorporated into proteins, such as the neurotransmitter serotonin. It has not been available as a dietary supplement in the United States since 1989 but is sold commercially outside of the United States.


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Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more