Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome People who live with depression have low blood levels of a specific molecule, new medical research has revealed. It's called acetyl L carnitine, and those with particularly severe, treatment resistant or childhood onset depression were Choline Linus Pauling Institute Oregon State University Potential Role of L Carnitine in Autism Spectrum Disorder Eating, diet, and nutrition for the treatment of non alcoholic fatty liver disease