A is a cytoplasmic organelle that generates, through oxidative phosphorylation, molecules of ATP, a chemical used to store and generate energy for cellular functions, including proliferation. Neurons and muscle cells are Frontiers Association between fatigue, peripheral serotonin, and L carnitine in hypothyroidism and in chronic fatigue syndrome Metabolic Maintenance Acetyl L Carnitine Acetyl L Carnitine VS L Carnitine: Which is Better? Metabolic Maintenance Acetyl L Carnitine