Comfrey leaves contain allantoin, a substance that promotes cell growth and repair, and reduces inflammation. Comfrey can be used to help wounds, bruises, and other skin problems. Be careful that wounds are not infected prior to use. Comfrey helps from the inside out. Comfrey can be used to help pain and inflammation from sprains, broken bones, and other injuries. Comfrey leaves can be used to make oils that nourish and moisturize skin and hair. Makes a great oil to make salve with. Not recommended for internal use. Not to treat, cure or prevent Comfrey also contains toxic substances called pyrrolizidine alkaloids that can damage the liver over time and be fatal. Comfrey is not recommended for: Internal use, Pregnancy or nursing, Infants, Liver or kidney disease, and Patients with hypersensitivity or allergic reactions to the plant.