The immune system protects the body from possibly harmful substances by recognizing and responding to antigens. Antigens are substances (usually proteins) on the surface of cells, viruses, fungi, or bacteria. Nonliving substances such as toxins, chemicals, drugs, and foreign particles (such as a splinter) can also be antigens. The immune system recognizes and destroys, or tries to destroy, substances that contain antigens.
Is your immune system functioning at optimum levels?
Inflammation and infection of internal organs
Blood disorders, such as low platelet counts or anemia
Digestive problems, such as cramping, loss of appetite, nausea and diarrhea
Delayed growth and development