Forms of phenylalanine may access your brain’s assembly of assertive neurotransmitters, such as serotonin and norepinephrine, which may accept a absolute aftereffect if acclimated with antidepressants. A 2005 abstraction in the account “Neuropsychopharmacology” begin that burning of phenylalanine and tyrosine bargain accolade behavior in those who had ahead suffered from depression. The University of Maryland Medical Center letters that some studies accept appear allowances of phenylalanine but few accept been contempo or well-controlled.