They make your immune system stronger and protect you against antigens (toxins or foreign substances) the body may have already encountered. How does it happen? Well, B-Cells trigger the B lymphocytes to produce antibodies. These antibodies are a special protein that latches onto the toxins, or antigens. The antibodies stay in your body for life, so that if that toxin ever comes face to face with the immune system again their ready to fight it off and keep you healthy!