Herbs: Black Walnut Hulls

The black walnut, or Juglans nigra tree, produces aromatic nuts, valued for their nutritional content and their semi-pungent flavor. The nuts develop within hard round shells, encased in thick green hulls. The hulls turn brown as the nut matures and falls from the tree. These hulls, or husks, are valuable in their own right as components in herbal health products. The FDA does not oversee the collection of black walnut hulls or the manufacture of herbal health products that contain hulls. Before using any herbal remedy, ask your doctor for advice.

Black Walnut Hull Products

Harvested from immature black walnuts, the hulls are still green when stripped from around the hard shell beneath. Once dried, manufacturers grind the hulls into a fine powder and sell it in bulk, or in tablets or capsules. A liquid tincture or extract is also available.

Components in Black Walnut Hulls

Jugalone and tannins are the main active ingredients in black walnut hulls, according to the "Gale Encyclopedia of Alternative Medicine." Other components include small amounts of vitamins C and B, iodine, beta-carotene and iron. Although unverified by scientific research, the hulls may possess antibacterial, anti-fungal and astringent properties.

Current Hull Uses and Potential Health Benefits

Herbal advocates use ground black walnut hulls to rid the body of intestinal parasites and worms. Due to the belief that the herb is antifungal, it is also valuable in the treatment of fungus disorders, including yeast-type infections, ringworm, jock itch and athlete's foot. Other unproven benefits include use as a blood purifier and a tonic for the kidneys, liver and other internal organs.

Side Effects and Considerations

Side effects are rare, according to the "Gale Encyclopedia," but they may include loose bowels with internal use and skin irritation from external use. No negative interactions with other medications are currently known. As a general precaution, pregnant women, nursing mothers and children should not use black walnut hull products unless directed to do so by a doctor. No standard dosage is available, but do not exceed the recommended dosage on the package, and discontinue use if you experience any side effects. In high doses, jugalone may be toxic to the kidneys and liver.