CoQ₁₀ is a core component of cellular energy production and mitochondrial respiration, shuttling electrons down the electron transport chain to produce the key energy-rich molecule adenosine triphosphate (ATP). As such, it provides energy support to the cells of the body and is especially supportive of tissues that require a lot of energy, such as the heart muscle. It also acts as an antioxidant, providing cellular protection from free radicals.