Increased plasma levels of competing amino acids, rather than lowered plasma tryptophan levels, are associated with a non-response to treatment in major depression

Ormstad, H., Dahl, J., Verkerk, R., Andreassen, O., & Maes, M. (). Increased plasma levels of competing amino acids, rather than lowered plasma tryptophan levels, are associated with a non-response to treatment in major depression. European Neuropsychopharmacology; European Neuropsychopharmacology.