C3 Protein is a key component of the complement system, which is part of the immune system. It plays a crucial role in identifying and eliminating pathogens, such as bacteria and viruses. When activated, C3 Protein can enhance inflammation and promote the clearance of foreign substances from the body. C3 Protein is produced mainly by the liver and is found in the blood. It can be activated through various pathways, leading to a cascade of reactions that help fight infections. Abnormal levels of C3 Protein can indicate immune system disorders or other health issues, making it an important marker in medical diagnostics.