Natural ways to activate dopamine Potential Role of L Carnitine in Autism Spectrum Disorder Tyrosine works on the supply side of brain chemistry. Many medications work on the holding side of catecholamines. When combined, this can sometimes lead to too much catecholamine activity in the brain. Amazon.com: Nootropics Depot N Acetyl L Tyrosine Capsules 350mg 120 Count NALT Amino Acid Supplement Natural Supplement Supports Memory, Learning, Focus, Healthy Stress Levels : Health & Household