Black Walnut Benefits | Gut Health, Parasites, Anti-Bacterial & Anti-Fungal

Black Walnut Health Benefits

Black walnut (Juglans nigra) is highly valued for its dark timber and is native to the western states of northeast America. In the past, herbal extracts made from black walnut hulls were used as hair dye & skin colourants. Medicinally, black walnut hulls are utilised to manage acne, inflammatory diseases, parasites, fungal, bacterial and viral infections.

Black Walnut Pharmacology

Botanical Name

Juglans nigra

Other Common Names

Green Black Walnut, Green Walnut, Jupiter's Nuts, Walnoot & Walnut.

Part Used


Main Therapeutic Compounds

Juglone and other phenolic compounds, including flavonoids, myricetin, quercetin, tannins, fixed oils, volatile oils, terpenoids, gallic acid and caffeic acid.

Herbal Actions








Black Walnut Herbal Benefits

Intestinal Parasites | Fungal, Bacterial and Viral infections | Constipation | Diarrhoea | Excessive sweating | Skin conditions

Antifungal & Antibacterial 

Black Walnut's main constituent, Juglone, has antifungal properties useful for conditions such as athlete's foot and ringworm. One study showed that Juglone inhibits the bacteria Helicobacter pylori, responsible for causing gastritis and peptic ulceration. It has been suggested that Black Walnut and the compound Juglone could become a new antibacterial agent to treat infections and prevent antibiotic resistance. 
Black Walnut has antifungal actions that have shown to be effective in reducing Candida. A study conducted at the University of Mississippi concluded that Black Walnut Hulls prevented Candida from developing and growing by inhibiting enzymes needed for yeast metabolism.


One of the primary benefits of Black Walnut Hulls is their ability to expel gastrointestinal worms and parasites. Black Walnut Hulls, are frequently used in parasite digestive cleanses for their high content of tannins and Juglone to improve bowel motility and expel parasites.

Constipation & Diarrhoea

Herbalists commonly use Black Walnut extract to relieve constipation and diarrhoea due to the astringent and soothing effects that the compound Juglone has on intestinal tissue. 

Black walnut Typical Use

Tea & Infusion

1 level teaspoon of Black Walnut powder mixed in herbal tea.

Tincture & Liquid Extract

Typical use of Black Walnut tincture or liquid extract is approximately 1-5mls daily, or as directed by your practitioner.

Herbal Combinations

Black Walnut combines well with Myrrh, Sweet Wormwood, Andrographis, Oregano, Thyme & Calendula

Cautions & Safety

Not recommended during pregnancy and lactation.

Must be avoided in people with nut allergies.
If you have a medical condition or take pharmaceutical medications, please consult your primary healthcare practitioner prior to use.


Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.

McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997. 

Inbaraj JJ, Chignell CF. Cytotoxic action of juglone and plumbagin: a mechanistic study using HaCaT keratinocytes. Chem Res Toxicol 2004;17:55-62 

Montoya, J., Varela-Ramirez, A., Estrada, A., Martinez, L. E., Garza, K., and Aguilera, R. J. A fluorescence-based rapid screening assay for cytotoxic compounds. Biochem Biophys.Res.Commun. 12-24-2004;325(4):1517-1523. 

Amarowicz, R., Dykes, G. A., and Pegg, R. B. Antibacterial activity of tannin constituents from Phaseolus vulgaris, Fagoypyrum esculentum, Corylus avellana and Juglans nigra. Fitoterapia 2008;79(3):217-219.  


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