Exosomes are the vehicles used by stem cells to carry and transfer messages between cells in the body. Due to their small size of 40-100 nanometers which is roughly one millionth the size of a human hair, exosomes are able to travel long distances in the body. These extraordinary tiny particles have the ability to promote health and longevity by transmitting regenerative signals that stimulate the repair of old, damaged, and or dysfunctional cells, and reestablish cellular behavior throughout the body. Exosomes also reduce inflammation and oxidative stress, modulate the immune system by regulating T cell and B cell function, and improve overall cellular health.