Aromatic L-Amino Acid Decarboxylase (AAAD) is an enzyme that plays a crucial role in the synthesis of neurotransmitters. It catalyzes the decarboxylation of aromatic L-amino acids, such as L-tyrosine and L-tryptophan, converting them into their corresponding amines, like dopamine and serotonin. This process is essential for proper brain function and mood regulation. AAAD is primarily found in the central nervous system and peripheral tissues. Its activity is vital for maintaining the balance of neurotransmitters, which are chemicals that transmit signals in the brain. Dysregulation of AAAD can lead to various neurological disorders, highlighting its importance in human health.