Last verified: 16 days ago
Black Walnut Hull
Also known as: Juglans nigra, Black Walnut Hull Extract, Green Black Walnut Hull
Evidence under review. — Not yet rated
Traditional herbal supplement with no clinical trial evidence; used historically for parasites and digestion.
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What it does
Black walnut hull is the outer green casing of the black walnut tree (Juglans nigra). It contains a compound called juglone, which has shown antibacterial and antifungal activity in laboratory...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose
What the Science Says
Black walnut hull is the outer green casing of the black walnut tree (Juglans nigra). It contains a compound called juglone, which has shown antibacterial and antifungal activity in laboratory (test-tube) studies. Traditionally, it has been used to support digestive health and to address intestinal parasites, but no human clinical trials have been conducted to confirm these effects.
What It Doesn't Do
No proven ability to kill parasites in humans — lab results don't equal real-world results. Not a proven treatment for skin conditions like psoriasis. No clinical evidence it improves cardiovascular health. Not a substitute for prescribed antiparasitic or antifungal medications.
Evidence-Based Benefits
Black walnut hull extracts show antibacterial and antifungal activity in laboratory test-tube studies.
Weak EvidenceEffective at: No established dose
Traditionally used to support digestive health and gut balance, though no clinical trials confirm this.
Weak EvidenceEffective at: No established dose
Absorption & Bioavailability
Unknown — no human pharmacokinetic studies available in the provided data.
Red Flags to Watch For
- No human clinical trials exist to support any health claims
- Contains juglone, which is toxic to some animals and plants — long-term human safety is unestablished
- Not recommended during pregnancy or breastfeeding
- May interfere with iron absorption — avoid if you have anemia
- Potential for allergic reactions, especially in people with tree nut allergies
- Not intended for long-term continuous use according to product labeling
Products Containing Black Walnut Hull
See how Black Walnut Hull is used in these analyzed products:
Frequently Asked Questions
What does Black Walnut Hull do?
Traditional herbal supplement with no clinical trial evidence; used historically for parasites and digestion.
What is the effective dose of Black Walnut Hull?
No established dose
Is Black Walnut Hull safe?
No human clinical trials exist to support any health claims
What doesn't Black Walnut Hull do?
No proven ability to kill parasites in humans — lab results don't equal real-world results.
Research Sources
- NIH DSLD
- NIH Office of Dietary Supplements
- Web
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-09-18