L-Tryptophan, a<unk>  of serotonin and melatonin and an example of a<unk> .<unk> s are<unk> s of monoamines and monoamine neurotransmitters in the body. The amino acids L-tryptophan and L-5-hydroxytryptophan (5-HTP; oxitriptan) are<unk> s of serotonin and melatonin, while the amino acids L-phenylalanine, L-tyrosine, and L-DOPA (levodopa) are<unk> s of dopamine, epinephrine (adrenaline), and norepinephrine (noradrenaline). Administration of<unk> s can increase the levels of monoamine neurotransmitters in the body and brain.<unk> s may be used in combination with peripherally selective aromatic L-amino acid decarboxylase inhibitors (AAAD inhibitors; also known as DOPA decarboxylase (DDC) inhibitors) such as carbidopa and benserazide. Carbidopa/levodopa is used to increase brain dopamine levels in the treatment of Parkinson's disease while carbidopa/oxitriptan (EVX-101) is under development as an antidepressant for possible use in the treatment of depression.
Monoamine precursor
Natural neuroactive substance
Monoamine neurotransmitter
Biogenic amine
Endopeptidase inhibitor
Neurotransmitter
Monoamine oxidase inhibitor
Exopeptidase inhibitor