Black Walnut Summary
There are a few species of walnut used medicinally.
The commercially significant nut-producing species is Juglans regia. This species is not usually used for medicine aside from the nutritive properties of the nuts. Juglans nigra (black walnut), however, is a popular herbal medicine.
It's used as an antiparasitic, and astringent. The green seed husks contain a high concentration of the active naphthoquinone known as juglone.
- Mouth and throat infections
- Chronic constipation
- Diarrhea and dysentery
- Haemorrhoids and portal congestion
- Pinworms or threadworms in children
- Skin eruptions (Whole plant)
- Respiratory infections
- Fungal infections
- Athletes foot
- Itchy scalp
- Eyelid inflammation
- Excessive perspiration on the hands and feet (Hyperhydrosis)
- Venous insufficiency (Leaves) .
- Haemorrhoids (leaves) 
- As a gargle to clean teeth and gums 
Herbal Actions (Nut/Husk):
- Stimulating Hepatic
All parts of the tree are antimicribial, and are used to treat bacterial, and parasitic infections. The green seed husks of Juglans nigeria are highly astringent, and are used to astring the skin and digestive tract to reduce gut permeability or treat hyperhydrosis. The seed husks are also potent antiparasitics and are useful in combination for removing parasites from the gastrointestinal tract.
Leaves, Bark, Fruit Husk
Walnut trees grow throughout the temperate zones of the world from North America, to Europe, to the Himalaya mountain range of Asia.
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Constituents of Interest
- Volatile oil
- Black Walnut
- English Walnut
- Hu Tao Ren (China)
- Persian Walnut
The walnut genus (Juglans) is part of the Juglandaceae family of plants, which are characterised by large, arromatic leaves, and catkin flowers. This family has about 10 genus' and roughly 50 species.
Other noteable members of this family include:
- Carya illinoinensis (Pecan)
- Carya spp. (Hickory)
The walnut family has several important members:
- Juglans regia (Persian walnut/ English walnut)
- Juglans nigra (Black Walnut)
- Juglans cinerea (Butternut)
Level Of Research:
Clinical Applications Of Walnut:
Walnut has a wide range of uses therapeutically. The main use for the green seed husk extracts is as an astringent and antiparasitic for the gastrointestinal tract and the skin.
The leaves and bark of various species are useful as a hepatoprotective, to lower blood pressure, regulate blood glucose and lower cholesterol and triglycerides, all of which are closely related.
There is an increasing number of trials running with walnut as an adjunctive treatment for cancer.
Walnut is extremely dangerous to dogs and horses, especially the green seed husks of Juglans nigra due to the high juglone content.
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For a list of references, visit the full walnut monograph.