What Amino Acid Lowers Serotonin? The Competitive Mechanism Explained
                                
                                
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                                    5 min read                                
                            
                                Research in both animals and humans demonstrates that diets enriched with certain amino acids can decrease brain serotonin levels by inhibiting the transport of its precursor, tryptophan. Understanding what amino acid lowers serotonin involves examining the critical competitive process at the blood-brain barrier.