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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Vitamin C [EPC]
Juglans Regia Leaf is a botanical agent primarily classified as a source of Vitamin C and a non-standardized plant allergenic extract, used for its astringent and antimicrobial properties.
Name
Juglans Regia Leaf
Raw Name
JUGLANS REGIA LEAF
Category
Vitamin C [EPC]
Drug Count
26
Variant Count
33
Last Verified
February 17, 2026
About Juglans Regia Leaf
Juglans Regia Leaf is a botanical agent primarily classified as a source of Vitamin C and a non-standardized plant allergenic extract, used for its astringent and antimicrobial properties.
Detailed information about Juglans Regia Leaf
References used for this content
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Juglans Regia Leaf.
According to the FDA-approved labeling and various pharmacopoeial standards, Juglans Regia Leaf contains a variety of bioactive compounds, including naphthoquinones (specifically juglone), flavonoids (such as quercetin and kaempferol), and a high concentration of ellagitannins. These components work synergistically to provide astringent, anti-inflammatory, and antimicrobial effects. As a Vitamin C source, it contributes to the maintenance of collagen synthesis and antioxidant defense mechanisms. Your healthcare provider may consider the use of Juglans Regia Leaf extracts in the management of dermatological conditions or as part of an allergen immunotherapy protocol.
The mechanism of action for Juglans Regia Leaf is multifaceted, depending on the route of administration and the specific clinical indication. At the molecular level, the primary active constituent, juglone (5-hydroxy-1,4-naphthoquinone), exerts potent antimicrobial and antifungal activity. It acts by inhibiting certain enzymes involved in the respiratory chain of microorganisms, effectively disrupting their energy production.
Furthermore, the high tannin content (up to 10%) provides an astringent effect. Tannins work by precipitating proteins on the surface of mucous membranes or damaged skin, creating a protective 'tanning' layer that reduces capillary permeability and decreases inflammation. This is particularly effective in treating minor skin irritations and excessive sweating. When used as an allergenic extract, the leaf proteins interact with the patient's immune system, specifically targeting IgE-mediated pathways to modulate the allergic response over time through desensitization.
Understanding the pharmacokinetics of Juglans Regia Leaf is essential for safe administration, although data on whole-leaf extracts is more complex than for isolated synthetic drugs.
Juglans Regia Leaf is employed in several therapeutic contexts, both as an FDA-recognized allergenic extract and as a traditional therapeutic agent:
Juglans Regia Leaf is available in several formulations to accommodate different therapeutic needs:
> Important: Only your healthcare provider can determine if Juglans Regia Leaf is right for your specific condition. The use of botanical extracts should always be supervised by a medical professional to ensure safety and efficacy.
Dosage for Juglans Regia Leaf varies significantly based on the form and the condition being treated.
The safety and efficacy of Juglans Regia Leaf in pediatric populations have not been extensively established in large-scale clinical trials.
Patients with significant renal impairment (CrCl < 30 mL/min) should exercise caution. While Vitamin C is water-soluble, excessive intake can lead to the formation of calcium oxalate stones. Your doctor may recommend a lower dose or frequent monitoring of kidney function.
There are no specific dosage adjustments provided for hepatic impairment; however, because the polyphenols in Juglans Regia Leaf are metabolized in the liver, patients with cirrhosis or hepatitis should be monitored for signs of hepatotoxicity.
Geriatric patients often have reduced renal clearance and may be more susceptible to the constipating effects of high-tannin oral preparations. Dosing should start at the lower end of the therapeutic range.
If you miss a dose of Juglans Regia Leaf, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and resume your regular schedule. Do not double the dose to catch up, as this increases the risk of gastrointestinal irritation.
Signs of an oral overdose may include severe nausea, vomiting, abdominal pain, and constipation due to high tannin intake. In extreme cases, the juglone content could theoretically cause oxidative stress in the blood. If an overdose is suspected, contact your local poison control center or seek emergency medical attention immediately. Treatment is generally supportive, focusing on hydration and gastric protection.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or stop the medication without medical guidance, especially if using it for allergy desensitization.
When using Juglans Regia Leaf, the most frequently reported side effects are localized or gastrointestinal in nature.
> Warning: Stop taking Juglans Regia Leaf and call your doctor immediately if you experience any of these serious symptoms.
Prolonged oral use of Juglans Regia Leaf (longer than 4–6 weeks) is generally discouraged. The high tannin concentration can interfere with the absorption of essential minerals, particularly iron, calcium, and zinc, potentially leading to nutritional deficiencies over time. Furthermore, chronic exposure to juglone has been studied in animal models for potential mutagenic effects, although human data is insufficient to establish a definitive long-term cancer risk.
At this time, there are no FDA black box warnings specifically for Juglans Regia Leaf. However, for the allergenic extract form, providers are cautioned regarding the risk of severe systemic allergic reactions during administration.
Report any unusual symptoms or persistent side effects to your healthcare provider. Monitoring of iron levels may be necessary if you are using this product long-term.
Juglans Regia Leaf is not a substitute for standard medical care. Patients should be aware that 'natural' does not always mean 'safe.' The active compounds in walnut leaves, particularly juglone and tannins, are pharmacologically active and can interact with various physiological processes. It is essential to use standardized products and follow medical advice strictly.
No FDA black box warnings for Juglans Regia Leaf. However, healthcare providers administering the allergenic extract form must be prepared to treat anaphylaxis and should observe patients for at least 30 minutes following an injection.
If your healthcare provider prescribes Juglans Regia Leaf for an extended period, the following may be monitored:
Juglans Regia Leaf is not known to cause sedation or cognitive impairment. It is generally considered safe to drive or operate machinery while using this substance, provided no allergic symptoms are present.
There is no direct contraindication between Juglans Regia Leaf and moderate alcohol consumption. However, alcohol can exacerbate the gastrointestinal irritation caused by tannins. It is advisable to limit alcohol if you experience stomach upset.
There is no known withdrawal syndrome associated with Juglans Regia Leaf. However, if used for its astringent properties to treat a condition like diarrhea or skin inflammation, stopping the medication abruptly may result in a return of symptoms.
> Important: Discuss all your medical conditions, especially nut allergies and kidney history, with your healthcare provider before starting Juglans Regia Leaf.
While few drugs are strictly contraindicated, Juglans Regia Leaf should not be used in combination with oral iron supplements at the same time of day. Tannins bind to non-heme iron in the gastrointestinal tract, forming insoluble complexes that prevent iron absorption. This can lead to the failure of iron deficiency anemia treatment.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking. A complete medication review is necessary to prevent dangerous interactions.
Juglans Regia Leaf must NEVER be used in the following circumstances:
Patients who are sensitive to other members of the Juglandaceae family (such as Butternut or Hickory) are likely to be cross-sensitive to Juglans Regia Leaf. Additionally, there is some evidence of cross-sensitivity with certain pollens (e.g., birch pollen) in the context of Oral Allergy Syndrome (OAS).
> Important: Your healthcare provider will evaluate your complete medical history, including any history of allergic reactions to food or environmental triggers, before prescribing Juglans Regia Leaf.
Juglans Regia Leaf is generally classified as Category C (by traditional standards). There are no adequate and well-controlled studies in pregnant women. Animal studies on juglone have suggested potential developmental toxicity at very high doses. It is recommended that pregnant women avoid oral Juglans Regia Leaf preparations. Topical use on small areas may be considered only under strict medical supervision during the second and third trimesters.
It is unknown whether the constituents of Juglans Regia Leaf, such as juglone or specific flavonoids, pass into human breast milk. Vitamin C does pass into milk, which is generally safe. However, the potential for tannins to cause constipation in the nursing infant or for juglone to cause oxidative stress remains a concern. Breastfeeding mothers should consult their pediatrician before use.
Juglans Regia Leaf is not FDA-approved for general use in children under 12. In the context of allergen extracts, it is used in children as young as 5 for immunotherapy, but only under the care of a specialist. There is a risk that high tannin intake could interfere with growth by inhibiting the absorption of essential minerals like iron and calcium.
Older adults are at an increased risk for side effects. Reduced kidney function can lead to higher systemic levels of metabolites. Furthermore, the constipating effect of tannins is more pronounced in the elderly, who may already have sluggish bowel function. Polypharmacy in this age group also increases the risk of drug-drug interactions, particularly with blood thinners and heart medications.
For patients with a GFR < 60 mL/min, oral use should be limited. The risk of secondary hyperoxaluria (excessive oxalate in the urine) from the Vitamin C component can lead to kidney stones or further renal damage. Monitoring of urinary oxalate levels may be required.
In patients with Child-Pugh Class B or C hepatic impairment, the metabolism of polyphenols is significantly slowed. This can lead to an accumulation of juglone, which may further stress the liver. Juglans Regia Leaf should be avoided in patients with active liver disease or unexplained elevations in transaminases.
> Important: Special populations require individualized medical assessment. Never start a new supplement or botanical treatment without consulting a specialist who understands your specific health profile.
Juglans Regia Leaf functions through a complex interplay of its primary constituents. The naphthoquinone juglone acts as a cytotoxic agent against pathogens by inducing oxidative stress and inhibiting the enzyme peptidyl-prolyl cis/trans isomerase (Pin1), which is involved in cell cycle regulation.
In the context of its Vitamin C [EPC] classification, it acts as a cofactor for the enzymes prolyl hydroxylase and lysyl hydroxylase, which are critical for the cross-linking of collagen fibers. This supports the structural integrity of the skin and blood vessels. The ellagitannins act as astringents by cross-linking with proteins (specifically proline-rich proteins) on tissue surfaces, forming a protective barrier that reduces exudation and inflammation.
The onset of the astringent effect is almost immediate upon topical contact. For oral Vitamin C effects, peak plasma concentrations are typically reached within 2–3 hours. The antimicrobial effects of juglone are dose-dependent, with minimum inhibitory concentrations (MICs) varying across bacterial and fungal species. Tolerance to the GI effects of tannins does not typically develop; rather, side effects may worsen with prolonged use.
| Parameter | Value |
|---|---|
| Bioavailability | 30-40% (for flavonoids); >80% (for Vitamin C at low doses) |
| Protein Binding | 70-90% (primarily albumin for juglone metabolites) |
| Half-life | 1.5 - 2 hours (Juglone); 10-20 hours (Vitamin C) |
| Tmax | 2 - 4 hours (Oral) |
| Metabolism | Hepatic (Glucuronidation, Sulfation); CYP3A4 inhibition potential |
| Excretion | Renal (80%), Fecal (20%) |
Juglans Regia Leaf is classified as a Botanical Drug and an Allergenic Extract. Within the EPC system, it is categorized as Vitamin C [EPC] and Non-Standardized Plant Allergenic Extract [EPC]. It shares therapeutic similarities with other tannin-rich botanicals like Quercus alba (White Oak) and Hamamelis virginiana (Witch Hazel).
Medications containing this ingredient
Common questions about Juglans Regia Leaf
Juglans Regia Leaf is primarily used for its astringent, anti-inflammatory, and antimicrobial properties in treating skin conditions like eczema, acne, and excessive sweating. It is also recognized as a natural source of Vitamin C and is used in clinical allergy settings as an allergenic extract for diagnosis and immunotherapy. Some traditional uses include treating minor digestive upsets, though this should only be done under medical supervision. Your doctor may also recommend it as a topical soak for minor scalp or skin inflammations.
The most common side effects include gastrointestinal issues such as nausea, stomach cramps, and constipation when taken orally. Topically, it often causes a temporary brownish discoloration of the skin due to the tannins and juglone, as well as mild redness or itching. These effects are generally mild and resolve once the use of the leaf extract is stopped. If you experience severe skin blistering or signs of an allergic reaction, you should seek medical attention immediately.
There is no known direct chemical interaction between Juglans Regia Leaf and alcohol. However, both substances can irritate the lining of the stomach, so consuming them together may increase the likelihood of experiencing nausea or abdominal pain. It is generally best to limit alcohol intake if you are using walnut leaf for gastrointestinal or inflammatory conditions. Always check with your healthcare provider regarding your specific health status.
The safety of Juglans Regia Leaf during pregnancy has not been clearly established, and it is generally classified as Category C. Because the active compound juglone can have potent biological effects, most healthcare providers recommend avoiding oral use during pregnancy. Topical use on very small areas of the skin may be acceptable, but only if deemed necessary by a physician. Always discuss the risks and benefits with your OB/GYN before using any herbal or botanical product.
For topical conditions like skin inflammation or sweating, you may notice an improvement within 2 to 3 days of regular application. When used as a Vitamin C source, it takes several days of consistent use to affect systemic levels. In the case of allergen immunotherapy, the process is much slower, often taking several months to years to achieve full desensitization. If your symptoms do not improve within a week of starting treatment, consult your healthcare provider.
Yes, you can typically stop taking Juglans Regia Leaf suddenly without experiencing withdrawal symptoms, as it does not cause physical dependence. However, if you were using it to manage a chronic condition like skin inflammation, your symptoms may return shortly after you stop. If you are undergoing allergen immunotherapy, you must never stop the treatment without consulting your allergist, as this can disrupt the desensitization process. Always inform your doctor before making changes to your regimen.
If you miss a dose, take it as soon as you remember, unless it is nearly time for your next scheduled dose. In that case, skip the missed dose and continue with your normal schedule. Do not take two doses at once to make up for the one you missed, as this can increase the risk of stomach irritation. For missed doses of allergenic extract injections, contact your allergist immediately for instructions, as the schedule is critical for safety.
There is no clinical evidence to suggest that Juglans Regia Leaf causes weight gain. The active constituents do not affect metabolic rate or appetite in a way that would lead to increased body fat. If you notice sudden weight gain or swelling while taking this or any supplement, it is more likely related to an underlying condition or another medication. Consult your healthcare provider to determine the cause of any unexpected weight changes.
Juglans Regia Leaf can interact with several types of medications, particularly those that are sensitive to tannins, such as iron supplements and certain alkaloids. It may also interfere with blood-thinning medications like warfarin or drugs metabolized by the liver's CYP3A4 enzyme. Because it can bind to many minerals and drugs in the stomach, it is best to take it at least 2 hours apart from other medications. Always provide your doctor with a full list of your current medications.
Juglans Regia Leaf is a botanical substance and is widely available under various generic and brand names as a dietary supplement or herbal extract. However, the specific allergenic extract forms used in medical clinics are specialized products that may be branded. Since it is a natural product, it cannot be patented in its raw form, leading to many affordable generic options. Ensure you choose a high-quality, standardized product to ensure you are receiving the correct amount of active ingredients.