It is an immediate precursor that is used to assess central serotonergic function. It was used for the treatment of insomnia.
Kjell Fuxe; Larry L. Butcher; And Jörgen Engel. Dl-5-Hydroxytryptophan-Induced Changes In Central Monoamine Neurons After Peripheral Decarboxylase Inhibition. Journal Of Pharmacy And Pharmacology, 2011, 23 (6), 420-424.
Björn-Erik Roos; Göran Steg. The effect of L-3, 4-dihydroxyphenylalanine and DL-5- -hydroxytryptophan on rigidity and tremor induced by reserpine, chlorpromazine and phenoxybenzamine. Life Sciences, 1964, 3 (4), 351-360.