Feuille d'ortie (Urtica dioica subsp. dioica): Benefits, Dosage, Safety & Evidence

Questions fréquentes

How does nettle leaf work to reduce inflammation and allergies?

Nettle leaf contains bioactive compounds including quercetin, rutin, scopoletin, and caffeic acid that exert anti-inflammatory and antiallergic effects. These compounds work by inhibiting inflammatory mediators and reducing histamine release from mast cells. Quercetin acts as a natural antihistamine by stabilizing mast cell membranes. Research suggests nettle may also modulate the NF-κB inflammatory pathway. Evidence level B supports these mechanisms for allergic rhinitis and inflammatory conditions like arthritis.

What medications does nettle leaf interact with?

Nettle leaf has diuretic properties and may interact with diuretic medications, potentially enhancing their effects and increasing risk of dehydration and electrolyte imbalance. Due to potential effects on blood sugar, nettle may interact with diabetes medications, requiring glucose monitoring. Nettle may also interact with blood pressure medications, lithium, and anticoagulants. Patients with kidney disease should avoid nettle. Always consult a healthcare provider before combining nettle with prescription medications.

What is the recommended daily dosage of nettle leaf for adults?

The standard adult dosage for nettle leaf varies by preparation. For dried leaf tea, use 4-6 grams of dried leaves daily. For standardized extracts, take 300-600 mg three times daily. Fresh nettle juice can be taken at 30-60 mL daily. These dosages are supported by traditional use and clinical evidence for conditions like allergic rhinitis and arthritis (Evidence level B). Start with lower doses to assess tolerance and consult a qualified herbalist for personalized recommendations.

Is nettle leaf safe to take during pregnancy and breastfeeding?

Nettle leaf is generally considered safe during pregnancy and breastfeeding when consumed in food amounts or as a nutritive tonic. It provides iron, vitamins, and minerals that may support pregnancy nutrition. However, pregnant women should avoid large medicinal doses without healthcare provider supervision due to the diuretic effect, which may affect fluid balance. Proper hydration is essential during pregnancy. Always consult a healthcare provider before taking herbal supplements during pregnancy or while breastfeeding.

Does nettle leaf help with arthritis and joint pain?

Nettle leaf has demonstrated anti-inflammatory properties that may benefit individuals with arthritis. Evidence level B research suggests nettle can reduce inflammatory markers and provide symptomatic relief for osteoarthritis and rheumatoid arthritis. Compounds like quercetin and caffeic acid inhibit pro-inflammatory enzymes. Some studies indicate nettle leaf may reduce the need for NSAIDs when used alongside conventional treatment. Nettle can be taken internally as tea or extract, or applied topically for localized joint pain relief.

Why does fresh nettle sting and how do you prepare it safely?

Fresh nettle leaves contain stinging hairs called trichomes that inject histamine, formic acid, and other irritants upon contact, causing a stinging rash. To prepare nettle safely, always cook, dry, or process the leaves before consumption—these methods neutralize the stinging compounds. Dried nettle leaf for tea and cooked fresh nettle are safe and nutritious. Wear gloves when handling fresh nettle. Once properly processed, nettle is a nutrient-dense food rich in iron, vitamins, and minerals.

Fiche d'information compilée à partir de PubMed

Cette fiche a été compilée à partir de résumés PubMed (NIH) avec l'assistance d'une IA. Chaque affirmation factuelle est citée par un article PubMed réel (voir la liste des sources). Elle n'a pas encore été révisée par un humain — confirmez auprès d'un professionnel de santé avant utilisation.

Compilé à partir de 30 articles PubMed · modèle : gemma4:31b

Résumé

Nettle leaf (Urtica dioica) is a nutrient-rich herbaceous perennial used traditionally for cardiovascular disorders and inflammation [PMID:31163183, PMID:41913078].

Contexte

Stinging Nettle (Urtica dioica) is a unique herbaceous perennial flowering plant characterized by stinging hairs [PMID:31163183].

Usages traditionnels

It has a long history of use as a food source (e.g., soup or curry), as fiber, and as a medicinal plant, specifically for the control of cardiovascular disorders such as hypertension [PMID:31163183].

Composés actifs

Nettle leaf contains polyphenols (including phenolic acids and rutin), vitamins (including vitamin C), minerals (including calcium and iron), and kynurenic acid [PMID:40219059, PMID:27925706, PMID:41913078, PMID:24364456].

Mécanisme d'action

Leaf extracts may act as a P2-purinoceptor antagonist, attenuating electrical field stimulation-induced contractions in prostatic smooth muscle [PMID:35900970]. Other reported mechanisms include insulin secretagogue, PPARgamma agonistic, and alpha-glucosidase inhibitory effects [PMID:24273930], as well as the suppression of cytokines such as TNF-alpha and IL-1beta [PMID:15338166].

Preuves cliniques

Preuve BType 2 Diabetes Mellitus

Administration of nettle leaf extract (500 mg every 8 hours for 3 months) combined with conventional drugs improved glycemic control in patients with advanced T2DM [PMID:24273930].

Preuve BOsteoarthritic pain (base-of-thumb)

Daily application of stinging nettle leaf for one week resulted in significantly greater reductions in pain (VAS) and disability (HAQ) compared to placebo [PMID:10911825].

Preuve DPsoriasis

A mixture of herbal supplements including nettle leaf was used in a retrospective case study to attenuate psoriasis severity [PMID:34144535].

Preuve CRheumatoid Arthritis

Leaf extracts are used as anti-inflammatory remedies for rheumatoid arthritis [PMID:31163183].

Sécurité et effets indésirables

One case report described a 36-year-old female who developed acute liver injury with a cholestatic pattern from an over-the-counter herbal detox tea containing stinging nettle leaf [PMID:36636365]. In mouse studies, daily oral administration of 50 mg of leaf extract reduced male fertility by 53% [PMID:35900970].

Synthèse des preuves

Evidence is mixed, ranging from clinical trials showing efficacy in glycemic control and localized joint pain to animal studies suggesting potential impacts on male fertility and a single case report of hepatotoxicity.

Sources PubMed

1.PMID: 31163183 (2020) — Screening of pharmacological uses of Urtica dioica and others benefits. · Progress in biophysics and molecular biology
2.PMID: 35900970 (2022) — Aqueous extracts of Urtica dioica (stinging nettle) leaf contain a P2-purinoceptor antagonist-Implications for male fertility. · PloS one
3.PMID: 29881711 (2018) — Protective effect of Urtica dioica leaf hydro alcoholic extract against experimentally-induced atherosclerosis in rats. · Avicenna journal of phytomedicine
4.PMID: 41913078 (2026) — Stinging nettle leaf powder: Functional, nutritional, antinutritional qualities and acceptability of a developed savoury snack. · Journal of the science of food and agriculture
5.PMID: 23728701 (2013) — Topical herbal therapies for treating osteoarthritis.

Feuille d'ortie

Sources et citations

Calculer une dose sûre de Feuille d'ortie

Bee Pollen

Nettle

Spirulina

Questions fréquentes

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Synthèse des preuves

Sources PubMed

Sources gouvernementales

Feuille d'ortie

Sources et citations

Calculer une dose sûre de Feuille d'ortie

Plantes associées

Bee Pollen

Nettle

Spirulina

Questions fréquentes

Résumé

Contexte

Usages traditionnels

Composés actifs

Mécanisme d'action

Preuves cliniques

Sécurité et effets indésirables

Synthèse des preuves

Sources PubMed

Sources gouvernementales