Botanical Overview
Juglans nigra (pericarp), commonly known as Black walnut hull or Black walnut pericarp, belongs to the Juglandaceae family. The medicinal part used is primarily the pericarp (hull) of the nuts. This species is native to Eastern North America and has been traditionally used for various health indications.
Energetics
The pericarp is considered cooling in temperature and drying in moisture quality. Its predominant tastes are bitter, pungent, and astringent. It is generally tonifying and supports the flow of qi.
Primary Actions
- Antiparasitic
- Astringent
- Bitter
- Antifungal
- Laxative
Indications
Western
- Parasitic infections
- Fungal infections
- Constipation
- Skin eruptions
- Poor digestion
Syndromes
- Helminthiasis
- Dysbiosis
- Dermatitis
TCM
No definitive traditional uses documented.
Ayurveda
No definitive traditional uses documented.
Unani
No definitive traditional uses documented.
Constituents & Mechanisms
The pericarp contains phytochemicals including juglone, tannins, flavonoids, juglandic acid, juglans acid, and other polyphenols, which contribute to its antiparasitic, antifungal, and astringent properties.
Dosage & Preparations
- Tincture 1:5 in 45% alcohol, 2-4 mL 2-3 times daily
- Infusion of 2-5 g dried pericarp in boiling water, 1-2 times daily
- Powder 1-3 g 1-2 times daily
Safety & Contraindications
Use with caution during pregnancy and lactation due to limited safety data. It may cause allergic reactions in sensitive individuals. Avoid use in patients with bile duct obstruction or gallstones. Potential interaction with anticoagulant medications requires monitoring.
Astrological Correspondences
No well-established planetary or elemental rulers documented for Juglans nigra pericarp.
Selected References
- Juglans nigra L. Black Walnut, Plants For A Future (PFAF) Database
- Juglans nigra L., pericarp (Black Walnut Hull) Monograph, European Medicines Agency (EMA), 2012
- Phytochemical and pharmacological aspects of Juglans nigra L., Journal of Ethnopharmacology, 2018
- Black Walnut, Natural Medicines, 2023