Here is the excerpt from Dr. Christophers School of Natural Healing:
Both the roots and leaves have moderately diffuse and stimulating alterative effects for the circulatory system. They also assist the glandular system, healing the lymph and epidermal areas in scrofulous and skin diseases. Plantain is an excellent remedy for kidney and bladder troubles. It is an effective remedy for poisonous bites and stings, since the poison of fresh stings is extracted rapidly, often within an hour's time.
It is the best herb for blood poisoning: reducing the swelling and completely healing a limb where poisoning has made amputation imminent. Finally, it is very useful for easing pain and healing problems in the lower intestinal tract. This valuable "weed" is often found in soils close to most habitations, in parks, sports fields, etc.