A relatively small fat-soluble organic (i.e., carbon-containing) molecule, found in membranes throughout the in the body. It readily transports both electrons and protons. Its many essential functions are still being discovered. In oxidative phosphorylation, the main chemical pathway by which food is converted into energy, it carries electrons from Complexes I and II to Complex III. It is a strong anti-oxidant, it serves to protect many cell components from destructive oxidation. It is often included in “mito cocktails” to help alleviate the symptoms of mitochondrial disease