Pure Herbs Herbal extracts historically used to support the Lymphatic System, which includes the lymph nodes, lymph ducts and lymph vessels, is a secondary circulatory system that helps the body fight infection and maintain its fluid balance. The Lymphatic System, which includes the lymph nodes, lymph ducts and lymph vessels, is a secondary circulatory system which helps the immune system to remove and destroy waste, debris and toxins. It helps deliver nutrients to the cells of the body and removes waste and excess fluid from spaces between the cells.