Red light wavelengths are administered to (shined upon) your skin and they penetrate to the cells below. Your mitochondria (the energy production centers or “powerhouses” of your cells) are stimulated, triggering the production of adenosine triphosphate (ATP). ATP is an organic compound within your body that is responsible for all biochemical energy transfer. It is frequently referred to as the “molecular currency” by which cellular energy is transferred throughout your body.