C3a Receptor Agonists are primarily used in research and therapeutic settings to modulate immune responses. They are applied in studies focusing on inflammatory diseases, as they can activate the C3a receptor, which plays a role in immune cell signaling. This activation helps in understanding mechanisms of inflammation and potential treatments for conditions like sepsis, asthma, and autoimmune disorders. Additionally, they are explored in regenerative medicine to promote tissue repair and in cancer research to investigate their role in tumor microenvironment modulation.