Black Walnut

An eastern US tree, the bark of which contains iodine and tannins; it is analgesic, anthelmintic, antifungal, antiseptic, and laxative. It has been used internally for constipation, intestinal parasites, and oral ulcers, and topically for acne, athlete’s foot, eczema, fever blisters, jock itch, and psoriasis

Mentioned in

binomial nomenclature
folk cures for cancer

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