L-tryptophan

noun

L-tryp·​to·​phan ˈel-ˈtrip-tə-ˌfan How to pronounce L-tryptophan (audio)
: the levorotatory form of tryptophan that is a precursor of serotonin and was used formerly as a dietary supplement especially to promote sleep and relieve depression

Examples of L-tryptophan in a Sentence

Recent Examples on the Web This could be due to ingredients like ginger or L-tryptophan, which can irritate sensitive stomachs. Amber Smith, Discover Magazine, 5 Aug. 2023 With a unique blend of hemp seed oil, Thiamine, and L-tryptophan, these chews effectively reduce stress and tension in dogs, promoting a sense of calm. Amber Smith, Discover Magazine, 4 July 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'L-tryptophan.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1949, in the meaning defined above

Time Traveler
The first known use of L-tryptophan was in 1949

Dictionary Entries Near L-tryptophan

Cite this Entry

“L-tryptophan.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/L-tryptophan. Accessed 21 May. 2024.

Medical Definition

L-tryptophan

noun
L-tryp·​to·​phan ˈel-ˈtrip-tə-ˌfan How to pronounce L-tryptophan (audio)
: the levorotatory form of tryptophan that is a precursor of serotonin and was formerly used in some health food preparations in the belief that it promoted sleep and relieved depression see eosinophilia-myalgia syndrome
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