What is Walnut Leaf (Persian Golnar)?

Walnut leaf comes from Juglans regia, the Persian walnut tree native to Central Asia and long cultivated across the Middle East, Mediterranean, and South Asia. While the walnut nut gets most of the attention, the leaf has its own rich medicinal tradition — particularly in Persian (Iranian), Turkish, and Southern European herbal medicine where it has been prescribed for skin disease, diabetes, and digestive complaints for over a thousand years. It is rich in polyphenols, tannins, and a unique compound called juglone that gives it powerful antimicrobial and astringent properties.

How does Walnut Leaf (Persian Golnar) work?

Walnut leaf works through several overlapping pathways. Its tannins and juglone act as natural astringents and antimicrobials, tightening tissue, reducing inflammation, and fighting bacteria and fungi on the skin and in the gut. Its polyphenols and flavonoids help the body use insulin more effectively, which is why it has traditional and emerging modern use for blood sugar management. The leaf also appears to reduce oxidative stress, which plays a role in aging, inflammation, and chronic disease.

What forms does Walnut Leaf (Persian Golnar) come in?

Tea made from dried walnut leaves is the most traditional form and remains common in Persian and Eastern European households. Capsules and standardized extracts offer more consistent dosing for blood sugar and anti-inflammatory goals. Topical washes, soaks, and compresses made from a strong leaf decoction are widely used in European naturopathic and herbal traditions for eczema, wound care, and fungal skin conditions. Tinctures are available in specialty herbal apothecaries.

Where it comes from:

In Persian traditional medicine (Tibb-e-Sonnati), walnut leaf — called Barg-e-Gerdoo — was prescribed for skin eruptions, worms, and diabetes-like symptoms. The ancient physician Avicenna (Ibn Sina) referenced walnut in his Canon of Medicine for digestive and skin conditions. European folk medicine, particularly in Germany, Italy, and France, adopted walnut leaf extensively for eczema and scrofula. German Commission E has formally evaluated walnut leaf for topical use in mild inflammation of the skin and excessive sweating.

What does Walnut Leaf (Persian Golnar) help with?

• Type 2 diabetes and blood sugar control: Walnut leaf tea has been used in Persian and Turkish folk medicine for generations to help manage blood sugar, and modern clinical trials have begun to confirm this. Its polyphenols appear to slow how quickly glucose is absorbed after meals and help the body respond to insulin more effectively, leading to lower fasting blood sugar levels over time.
• Eczema and inflammatory skin conditions: Soaking the affected area in a cooled walnut leaf decoction is a time-honored European remedy for eczema, psoriasis, and weeping skin rashes. The tannins act as natural astringents that tighten inflamed, oozy tissue while reducing redness — German Commission E recognized this use for mild skin inflammation.
• Skin infections (bacterial and fungal): Juglone, the leaf's standout compound, has well-documented activity against common skin pathogens including Staphylococcus and Candida species. Topical walnut leaf washes or compresses have been used traditionally — and are now supported by lab evidence — to treat minor skin infections, athlete's foot, and nail fungus.
• Diarrhea and digestive upset: The astringent tannins in walnut leaf help tone the gut lining and reduce fluid secretion, making walnut leaf tea a traditional go-to for diarrhea and irritable bowel flares. It was used in this way across Persian, German, and Eastern European folk medicine long before it attracted modern research attention.
• Excessive sweating (hyperhidrosis): Walnut leaf baths and soaks are a recognized European herbal remedy for people who sweat excessively from the hands and feet. The tannins work by temporarily tightening sweat gland openings and reducing secretion, providing noticeable relief with regular use.
• Wound healing: Applied as a compress or wash, walnut leaf decoction creates a mild antiseptic, astringent environment that helps protect minor wounds and abrasions from infection while supporting tissue tightening and early healing. This use is deeply embedded in both Persian and Southern European folk traditions.
• Intestinal parasites and gut imbalance: Juglone has demonstrated antiparasitic properties in laboratory studies, and walnut leaf has been used historically in Persian and Ayurvedic medicine to help clear intestinal worms and support a healthier gut environment. It is not a replacement for medical antiparasitic treatment, but may serve as a supportive remedy.
• High cholesterol and metabolic syndrome: Early clinical research suggests walnut leaf extract may help lower total cholesterol and triglycerides, likely through its antioxidant polyphenols reducing oxidative modification of LDL and its flavonoids supporting healthier lipid metabolism. This is an emerging area with promising but still limited human evidence.
• Mouth sores and gum inflammation: Rinsing with a cooled walnut leaf tea has been used in traditional European and Middle Eastern medicine to soothe mouth ulcers, inflamed gums, and mild oral infections. Its antibacterial and astringent properties make it a practical natural mouthwash for minor oral issues.
• Acne and oily skin: Walnut leaf's combination of antimicrobial and astringent action makes it a popular traditional topical for acne-prone or oily skin. Used as a facial rinse or diluted toner, it helps reduce surface bacteria, tighten pores, and calm redness without harsh chemicals.

What can Walnut Leaf (Persian Golnar) help prevent?

• Oxidative stress-related cellular damage (through polyphenol antioxidant activity)
• Post-meal blood sugar spikes in at-risk individuals

Which foods are rich in Walnut Leaf (Persian Golnar)?

1. Walnut (nut): From the same tree (Juglans regia), walnuts share many polyphenols including ellagitannins and flavonoids, though juglone is concentrated in the leaf and hull rather than the nut itself.
2. Black tea: Rich in ellagitannins and gallotannins that mirror the astringent and gut-toning properties of walnut leaf; useful as a dietary complement for digestive support.
3. Pomegranate: High in ellagic acid and ellagitannins similar to those in walnut leaf, supporting the same antioxidant and anti-inflammatory pathways relevant to blood sugar and skin health.
4. Berries (blueberry, blackberry, raspberry): Rich in quercetin, kaempferol, and other flavonoids shared with walnut leaf, supporting insulin sensitivity and reducing oxidative inflammation.
5. Green tea: Contains catechins and polyphenols that complement walnut leaf's blood sugar and antioxidant activity, and has its own evidence for supporting healthy glucose metabolism.

Practical Tips:

Walnut leaf itself is not typically eaten as a food — it is used as a medicinal tea, extract, or topical preparation. The foods listed above contain related compounds (tannins, ellagitannins, quercetin) that support the same pathways walnut leaf targets, particularly blood sugar regulation, antioxidant defense, and gut health. Eating walnuts regularly also provides overlapping polyphenol benefits.

What are the side effects of Walnut Leaf (Persian Golnar)?

• Skin irritation or contact dermatitis (from topical use, especially with concentrated juglone)
• Stomach upset or nausea (with high oral doses)
• Constipation (with excessive tannin intake)
• Temporary skin darkening or staining (from topical use: the leaf contains natural brown pigments)
• Allergic reactions in people with tree nut or walnut hypersensitivity
• Not recommended during pregnancy: insufficient safety data and traditional caution applies
• May reduce iron absorption if consumed with meals high in iron

Good to know:

Walnut leaf is generally considered safe when used in traditional amounts as a tea or topical preparation. It has a long history of use across multiple cultures without widespread reports of serious harm. High doses taken internally over long periods, or use during pregnancy, require caution.

How much Walnut Leaf (Persian Golnar) should you take?

• Recommended daily: Tea: 1–3 grams of dried walnut leaf steeped in 150 ml hot water, 2–3 times daily. Standardized extract (capsule): 300–500 mg daily, standardized to polyphenol content, per available clinical trial protocols. Topical decoction: 3–5 grams per 100 ml water, used as a wash or compress.
• Best time of day: For blood sugar support, take tea or extract before or with meals. For digestive support, drink tea between meals. Topical use can be applied as needed at any time.
• With or without food: Internal use is generally best taken with or just before meals for blood sugar benefits. Avoid taking alongside iron-rich meals or iron supplements.
• Time to effect: Skin and antimicrobial benefits: days to 1–2 weeks. Blood sugar and metabolic effects: 4–8 weeks of consistent daily use.
• How long to take it: Traditional use is often seasonal (several weeks on, then a break). For blood sugar or metabolic goals, a course of 8–12 weeks followed by reassessment with your healthcare provider is reasonable. Topical use can continue as needed. Avoid prolonged high-dose internal use without supervision.