You may be surprised to learn that black walnut offers a wide range of health benefits.

Herbal Actions: Antibacterial, antifungal, antiparasitic, antioxidative

Common Names: Black walnut, eastern black walnut (not to be confused with English walnut, Juglans regia)

Scientific Name: Juglans nigra

Family: Juglandaceae

Parts Used: Bark, nuts, hull

Key Phytochemicals and Their Benefits

• Quinones (Juglone): The primary active compound responsible for black walnut’s unique properties.
• Phenolic Compounds: Including phenolic acids, tannins, and proanthocyanidins, these have anti-inflammatory and antioxidative effects, while tannins offer astringent properties.
• Phytosterols: Reduce cholesterol absorption in the gut, supporting healthy blood cholesterol levels. Black walnut contains about 109 mg of phytosterols per 100 g.
• Tocopherols (Vitamin E): Especially alpha- and gamma-tocopherol, which are easily absorbed. Gamma-tocopherol has been linked to a lower risk of prostate cancer.

Medicinal Uses and Health Benefits

Black walnut is known for its allelopathic properties—producing compounds like juglone that inhibit the growth of certain trees nearby. For humans, juglone is not toxic and offers powerful antibacterial, antifungal, and antiviral effects. Studies show black walnut creams can be as effective against Candida albicans as conventional antifungal drugs like clotrimazole.

Additional Benefits Include:

• Antiparasitic: May help eradicate intestinal parasites such as roundworms and tapeworms.
• Anti-Cancer: Juglone has demonstrated activity against skin and colon cancer cells in lab studies.
• Anti-Inflammatory and Gout Relief: Black walnut husks inhibit xanthine oxidase, reducing uric acid buildup.
• Liver Protection: Animal studies suggest hepatoprotective effects against arsenic toxicity by reducing inflammation and oxidative stress.
• Rich in Omega-3s: Contains alpha-linolenic acid (ALA), supporting anti-inflammatory action, blood thinning, and immune balance.
• Nutrient Dense: Excellent source of phosphorus, potassium, folate, and arginine.
• Blood Pressure Support: Arginine converts to nitric oxide, relaxing blood vessels and lowering blood pressure. A study showed 8 black walnuts daily for 2 days reduced blood pressure in hypertensive individuals.

How to Use Black Walnut

• For Phytochemical Benefits: Use black walnut hulls in tinctures, extracts, or powders.
• For Nutritional Benefits: Consume the nuts in any preferred form. Daily consumption of 5–8 nuts is generally sufficient for general health.

Always follow product instructions if using supplements, as processing methods vary.

Contraindications

• Allergies to walnut family plants or nuts in general.
• Not recommended during pregnancy due to lack of safety data.

Safety Notes

• Black walnut is safe for humans but can be toxic to dogs and horses. Juglone can damage the nervous and muscular systems in dogs. For horses, contact with black walnut chips or sawdust can cause acute laminitis.
• Wild walnuts can develop Penicillium mold producing Penitrem A, which is toxic to livestock and dogs. Standardized extracts or commercially grown walnuts are safe.