Immune system rejuvenation is a research area focused on restoring and enhancing the function of the immune system, particularly in older individuals or those with compromised immune systems. This field explores various strategies and interventions to boost immune cell function, improve immune response to pathogens, and promote overall immune system health. Some approaches include dietary interventions, exercise, immunotherapy, and the use of certain compounds or drugs to enhance immune function and resilience. The goal of immune system rejuvenation is to improve the body's ability to fight off infections, prevent chronic diseases, and promote overall health and longevity.