Native Americans used the bark of the black walnut, a tree that grows in the eastern U.S., to treat skin problems such as ringworm. They drank a tea made from the bark as a laxative, and chewed on the bark to relieve headache pain. Today black walnut's bark, leaves, fruit rind and liquid extracts are prescribed by herbalists for constipation, fungal and parasitic infections, and mouth sores. Black walnut is rich in tannins and contains a large amount of iodine, which makes it a good antiseptic. Also, the herb is believed to relieve toxic blood conditions. And some evidence indicates that, if used internally over a long period, the herb will help eliminate warts caused by viruses.
Taken internally for:
Applied externally for:
Over the counter:
Black walnut is available as tinctures, extract, dried bark, leaves and fruit rind.
Decoction: Bark simmered in boiling water for 10 to 15 minutes.
Gargle: Decoction used as a mouthwash or gargle to treat mouth sores.
Extract: Rubbed on the affected area twice a day.
Poultice: A poultice made from the green rind of black walnut and applied to the sites of ringworm.