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 Acetyl L Carnitine Best Natural ADHD Supplements for Focus and Attention L CARNITINE increases muscle mass, reduces fat mass. Bangkok Hospital Headquarter FocusNeeds L Carnitine & Lipotrophic Injections for Energy & Exercise: Portland Clinic of Holistic Health: Holistic Cancer Care & Primary Care