L-tryptophan
L–tryp·to·phan
noun \ˈel-ˈtrip-tə-ˌfan\Definition of L-TRYPTOPHAN
: 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
First Known Use of L-TRYPTOPHAN
1949
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