What is Zero Age Treatment and Exosomes? Exosomes are defined as nano-sized vesicles secreted by cells and play an important role in intercellular communication. These microscopic structures are natural carriers that allow the cells in our body to communicate with each other. Exosomes, ranging in size from 30-150 nanometers, are pioneering revolutionary developments in the field of regenerative medicine thanks to the proteins, lipids, DNA and RNA molecules they contain. Exosome Therapy