All parts contain active ingredients. Decocted flowers make an eyewash, and leaf tea treats varicose veins. The flower syrup is antiseptic and a mild laxative, and with the leaves treats coughs, headaches, and insomnia. The root treats bronchitis. The leaves are a folk remedy for breast and lung cancer. The aerial parts of Heartsease are cleansing and are a circulation and immune system stimulant, used for chronic skin complaints.