Amino acids L Tyrosine is the raw building block for your dopamine. It is the material your brain needs to manufacture focus. Without it, you are trying to build a bridge with no L carnitine and Acetyl L Carnitine: A Possibility for Treating Alterations Induced by Obesity in the Central Nervous System Neurochemical Research Springer Nature Link Item L carnitine biosynthesis. Public Library of Science Figshare Natural Rhythm CoQ10 ZEN (Coenzyme Q10 + L Carnitine + L Theanine) for Cardiovascular Support, Mental Clarity and Focus, and to Help Reduce Anxiety and Stress (30 Capsules) Walmart.com The Role of l Carnitine in Mitochondria, Prevention of Metabolic Inflexibility and Disease Initiation