- What other names is Black Walnut known by?
- What is Black Walnut?
- How does Black Walnut work?
- Are there safety concerns?
- Are there any interactions with medications?
- Dosing considerations for Black Walnut.
Black walnut is used to treat parasitic worm infections and certain other infections including diphtheria and syphilis. It is also used for leukemia.
Some people use black walnut as a gargle, apply it to the scalp as hair dye, or put it on the skin to treat wounds.
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Black walnut is POSSIBLY UNSAFE when applied directly to the skin. It contains a chemical called juglone that might cause tongue or lip cancer, especially if applied daily.
Special Precautions & Warnings:Pregnancy and breast-feeding: Don't apply black walnut to the skin if you are pregnant or breast-feeding. This topical use is POSSIBLY UNSAFE. There is not enough reliable information about the safety of black walnut taken by mouth if you are pregnant or breast-feeding. Stay on the safe side and avoid use.
Medications taken by mouth (Oral drugs)
Interaction Rating: Moderate Be cautious with this combination.
Talk with your health provider.
Black walnut hulls contain a large amount of chemicals called tannins. Tannins absorb substances in the stomach and intestines. Taking black walnut along with medications taken by mouth can decrease how much medicine your body absorbs, and decrease the effectiveness of your medicine. To prevent this interaction, take black walnut at least one hour after medications you take by mouth.
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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
Last Editorial Review: 3/29/2011