The black walnut tree (Juglans nigra) grows naturally in the central and east central portions of the United States, producing aromatic nuts for use in foods and quality lumber for construction. However, it's the bark of the tree, the green hulls and the roots that contain potential antiparasitic and antimicrobial substances, reports the Physician's Desk Reference for Herbal Medicines. Used to rid the intestines of parasites and to treat other disorders, black walnut has a place in alternative medicine. Side effects may occur in some patients who use black walnut, especially in high doses.
Loose Stools
Consuming black walnut may result in loose stools or diarrhea. Capsules and tablets made from the dried herb are a popular treatment for intestinal worms, reports the PDR. The risk of developing diarrhea increases as the dose of black walnut increases. Consult a qualified herbalist before using black walnut to treat parasites and discontinue use if severe diarrhea develops. Do not exceed the dosage recommendations on the package unless directed to do so by a medical professional.
Allergic Reaction
Some patients may be allergic to black walnut, in which case side effects could be severe. PDRHealth.com warns patients to seek medical help immediately if they experience tightness of the chest and difficulty breathing. In allergic individuals, black walnut may also produce swelling, a rash and hives.
External Side Effects
Black walnut, when applied to the skin, may result in a rash in the same area. PDRHealth also lists a risk of developing skin tumors after using black walnut topically. The risk increases with repeated use.
Precautions
The Gale Encyclopedia of Alternative Medicine reports that when taken in moderation, as directed by an herbalist or on the package, black walnut is generally safe, unless the individual is allergic to the substance.
PDRHealth advises those with diagnosed liver disorders not to consume the substance. In addition, black walnut may not be safe for pregnant women and breastfeeding mothers. Individuals with high blood pressure and those who are taking medications should use black walnut under medical supervision only.
The Food and Drug Administration does not regulate herbal supplements, which are sold over-the-counter in health food stores. But these substances may still present health risks.
References
- PDRHealth: Black Walnut
- PDR for Herbal Medicines, 2nd Edition, Joerg Gruenwald, PhD, 2000
- "Gale Encyclopedia of Alternative Medicine, Volume 1"; Jacqueline L. Longe; 2005
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