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Oxitriptan, also known as L-5-hydroxytryptophan (5-HTP) and sold under various brand names, is a medication and over-the-counter dietary supplement used in the treatment of depression and for other indications.
5-HTP is produced from the amino acid tryptophan through the action of the enzyme tryptophan hydroxylase. Tryptophan hydroxylase is one of the biopterin-dependent aromatic amino acid hydroxylases. Production of 5-HTP is the rate-limiting step in 5-HT (serotonin) synthesis. 5-HTP is normally rapidly converted to 5-HT by amino acid decarboxylase. [1]
Research suggests that rhodiola rosea may reduce stress, as well as depression and anxiety symptoms. 5-HTP, also known as 5-hydroxytryptophan, has been found to increase serotonin levels in the brain.
The authors included only studies of a high rigor and included both 5-HTP and tryptophan in their review because of the limited data on either. Of 108 studies of 5-HTP and tryptophan on depression published between 1966 and 2000, only two met the authors' quality standards for inclusion, totaling 64 study participants.
In humans, the stimulation of serotonin production by administration of tryptophan has an antidepressant effect [3] [4] and inhibition of tryptophan hydroxylase (e.g. by p-Chlorophenylalanine) may precipitate depression. [5] The activity of tryptophan hydroxylase (i.e. the rate at which it converts L-tryptophan into the serotonin precursor L-5 ...
Oxitriptan [5-Hydroxytryptophan (5-HTP)] (Cincofarm, Levothym, Triptum) – precursor in serotonin biosynthesis Tryptophan (Tryptan, Optimax, Aminomine) – precursor in serotonin biosynthesis Adjunctive treatments
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