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Urtica dioica (stinging nettle) root extract was tested in a randomized, double-blind, placebo-controlled trial in 74 allergic rhinitis patients with confirmed skin prick tests. Treatment with 150 mg Urtica dioica for one month produced a statistically significant reduction in nasal smear eosinophil counts (p<0.01) compared to placebo, and a significant improvement in clinical symptoms on the SNOT-22 scale. An earlier double-blind trial by Mittman et al. also found global allergy symptom reduction with freeze-dried nettle leaf.
Urtica dioica is a documented rich source of polyphenolic antioxidants including chlorogenic acid, caffeic acid, caffeoylmalic acid, quercetin, and rutin. Multiple in vitro studies using human cell models—including skin fibroblasts and colon epithelial cells—have confirmed significant ROS scavenging and protection against oxidative stress-induced cell death. A 2025 human skin cell study (Molecules) confirmed protection of human fibroblasts against H2O2-induced oxidative damage.
Stinging nettle (Urtica dioica) has been used for arthritis since at least the 10th century. Ten clinical trials for OA have been conducted; a 2000 RCT (Phytomedicine) found topical nettle leaf relieved thumb OA pain. Nettle inhibits NF-κB, myeloid dendritic cells, and TNF-α, with multiple studies showing reduced OA pain and NSAID use.
Nettle root extract has been evaluated in multiple randomized controlled trials for lower urinary tract symptoms (LUTS) associated with benign prostatic hyperplasia (BPH), including urinary frequency, nocturia, weak flow, and incomplete emptying. A prospective, double-blind, placebo-controlled crossover RCT (n=620) demonstrated significant improvement in IPSS scores versus placebo. Lignans in nettle root inhibit SHBG receptor binding on prostate membranes and suppress aromatase activity, providing a plausible mechanism. A systematic review of six RCTs (n=1,210) confirmed these findings with GRADE-assessed evidence.
Nettle has been studied as an antihypertensive in human and animal studies. A clinical trial in Lebanon prescribed nettle extract to mild hypertension patients over 16 weeks, with results suggesting reduction in both systolic and diastolic blood pressure via vasodilation, calcium channel blocking, and diuretic mechanisms. A review of multiple in vitro, animal, and clinical studies confirmed consistent blood-pressure-lowering findings.
Multiple RCTs and a systematic review with meta-analysis support nettle leaf extract's ability to reduce fasting blood glucose, postprandial glucose, and HbA1c in type 2 diabetes patients. A 2013 double-blind RCT (Kianbakht et al.) found significant reductions in all three glycemic markers versus placebo. A meta-analysis of eight RCTs confirmed significant lowering of fasting blood sugar in T2DM. Proposed mechanisms include alpha-glucosidase inhibition, GLUT-2 upregulation, enhanced insulin secretion, and reduced intestinal glucose absorption.
Stinging nettle (Urtica dioica) has documented anti-inflammatory activity supported by both mechanistic in vitro/in vivo research and human clinical trials. Its primary mechanism involves inhibition of the NF-κB transcription factor, suppression of pro-inflammatory cytokines (TNF-α, IL-1β, IL-17), and inhibition of COX and 5-lipoxygenase enzymes. A randomized double-blind placebo-controlled trial in rheumatoid arthritis patients demonstrated significant reductions in DAS28 disease activity scores, CRP, and IL-17 following supplementation. The evidence base, while promising, is still limited in scale and warrants larger confirmatory trials.
Nettle (Urtica dioica) extract inhibits key receptors and enzymes associated with allergic reactions, including H1 receptor antagonism, mast cell tryptase inhibition, and COX-1/COX-2 inhibition. A double-blind study found 300 mg freeze-dried nettle rated more effective than placebo by 69% of allergic rhinitis patients. It is recognized as a clinically relevant natural antihistamine for food and environmental allergic responses.
Stinging nettle (Urtica dioica) has traditional use for gout as a diuretic to promote uric acid excretion. A small 2025 human clinical study and a 2017 study found nettle may reduce uric acid levels in people with hyperuricemia or gout. Nettle's flavonoid constituents (quercetin, kaempferol) inhibit xanthine oxidase in vitro.
Stinging nettle (Urtica dioica) acts as a natural antihistamine through H1 receptor antagonism and mast cell tryptase inhibition, mechanisms characterized by Roschek et al. (Phytother Res, 2009). A randomized double-blind clinical trial in allergic rhinitis patients found that freeze-dried Urtica dioica reduced allergy symptoms, and a 2017 RCT confirmed significant improvement in symptom severity scores.
Randomized clinical trials in type 2 diabetes patients have demonstrated improvements in insulin sensitivity markers following nettle supplementation. A double-blind RCT by Namazi et al. (2011) on 50 T2DM patients using hydro-alcoholic nettle extract over 8 weeks showed improved insulin sensitivity alongside reduced inflammatory markers. Mechanistic pathways include PPARγ agonism, enhanced pancreatic beta-cell function, and inhibition of carbohydrate-digesting enzymes.
Stinging nettle leaf (Urtica dioica) is a traditional diuretic used across European and Native American herbalism for urinary tract and kidney support, and is named in the 2018 PubMed systematic review of dietary plants for kidney stone prevention among those with 'considerable interest based on scientific evidence.' Its diuretic, anti-inflammatory, and antioxidant mechanisms support renal filtration and protection. Preclinical studies confirm inhibition of calcium oxalate crystal aggregation.
Stinging nettle (Urtica dioica) is used traditionally across Europe, Ayurveda, and North American herbalism as a kidney tonic and diuretic. Its leaf and seed have different kidney-related properties: the leaf provides diuretic (aquaretic) and anti-inflammatory action, while the seed is considered a more direct kidney trophorestorative in Western herbal practice. Research highlights its anti-inflammatory and antioxidant compounds, linked to reduced oxidative stress associated with kidney damage.
Nettle leaf (Urtica dioica) inhibits H1 histamine receptors, stabilizes mast cell membranes to reduce degranulation, inhibits mast cell tryptase, and blocks COX-1/COX-2 prostaglandin synthesis. It is specifically cited in MCAS management protocols as a natural antihistamine and mast cell stabilizer, and has been studied in a double-blind trial for allergic rhinitis.
Nettle root extract has been studied in RCTs for lower urinary tract symptoms including urinary urgency, frequency, nocturia, and incomplete bladder emptying—the hallmark features of overactive bladder. Products containing nettle root are specifically recommended for symptomatic treatment of urinary incontinence and frequency. The clinical trial database includes conditions directly overlapping with OAB symptom clusters.
Stinging nettle (Urtica dioica) has been used traditionally and studied clinically for allergic rhinitis, a primary cause of post-nasal drip. A randomized, double-blind, placebo-controlled trial (PMC5963652) in 40 perennial allergic rhinitis patients showed significant improvement in SNOT-22 symptom scores and reduced nasal eosinophil counts with nettle root extract. Its mechanisms include histamine antagonism and inhibition of COX-1/COX-2 enzymes.
Nettle root (Urtica dioica) is used in traditional European medicine and has clinical trial support for BPH. A meta-analysis of 6 RCTs (1,210 patients) showed modest improvement in IPSS scores versus placebo. A double-blind RCT in 100 patients showed significant AUA score reduction (26.5 to 2.1, p<0.001) with nettle versus no change in placebo.
Urtica dioica root is widely used for BPH in Europe with clinical trial support. A large double-blind RCT of 558 men demonstrated significant improvements in IPSS (8-point reduction), post-void residual (−37 mL), and prostate size (−4.8 cc) versus placebo. A 2016 meta-analysis concluded Urtica dioica is an effective and safe treatment for LUTS associated with BPH. Mechanisms include SHBG binding inhibition and prostate anti-inflammatory effects via phytosterols and lignans.
Stinging nettle (Urtica dioica) has traditional antihistamine and anti-inflammatory properties and is cited in urticaria management. A double-blind, placebo-controlled RCT cited in a 2025 Sage systematic review demonstrated significant reductions in symptom severity for acute urticaria patients. Naturopathic practitioners list it as a first-line agent for hives, typically combined with quercetin and vitamin C.
A 2022 randomized double-blind placebo-controlled trial (n=90 RA patients) showed that nettle supplementation significantly decreased the Disease Activity Score DAS28 and pain severity compared to placebo. Earlier clinical data include a German pilot RCT showing nettle plus low-dose diclofenac was as effective as standard diclofenac dose, and preclinical data confirm anti-inflammatory mechanisms via NF-κB inhibition and cytokine suppression.
Stinging nettle (Urtica dioica) has traditional European use for hay fever and a 2017 randomized double-blind placebo-controlled trial (n=74) showed significant improvement in allergic rhinitis symptom scores and reduction in nasal eosinophils. In vitro research shows nettle extract inhibits key enzymes in the allergic cascade. NCCIH acknowledges it among studied nutritional approaches for allergic rhinitis.
Stinging nettle (Urtica dioica) has preliminary evidence for seasonal allergic rhinitis. A randomized, double-blind, placebo-controlled trial showed significant improvement in SNOT-22 symptom severity and reduction in nasal eosinophil counts. In vitro studies confirm inhibition of mast cell degranulation, histamine activity, and prostaglandin formation, though NCCIH rates evidence as inconsistent and limited.
Stinging nettle (Urtica dioica) root extract was tested in a double-blind placebo-controlled RCT (n=74 allergic rhinitis patients) and showed significant improvement in clinical symptom severity (SNOT-22, p<0.001) and significant reduction in nasal eosinophil counts (p<0.01) versus placebo. It inhibits mast cell degranulation, NF-κB, COX-1/2, leukotriene synthesis, and histamine release in nasal mucosa. Traditional use in Ayurveda and European herbalism for rhinitis and sinus congestion is extensive.
Nettle root lignans bind competitively to sex hormone-binding globulin (SHBG) in vitro, with the lignan 3,4-divanillyltetrahydrofuran showing outstanding SHBG affinity. By displacing testosterone from SHBG, nettle may theoretically increase free testosterone availability. Two double-blind trials reported decreased SHBG levels during nettle root extract treatment; one trial found a modest increase in total testosterone concentrations.
Stinging nettle root (Urtica dioica) is used in European phytotherapy for BPH-related urinary symptoms and has been approved by the German Commission E for this indication. A systematic review and meta-analysis of five RCTs (1,128 patients) found significant improvements in IPSS, peak urinary flow rate, and prostate volume compared to placebo.
Nettle (Urtica dioica) juice has been traditionally consumed daily as a blood cleanser and infection eliminator in the context of abscesses, according to multiple herbalist references. Anti-inflammatory and nutritional properties are documented scientifically.
Stinging nettle (Urtica dioica) has been used for over 2,000 years as a blood-building remedy for iron-deficiency anemia. Its leaves are rich in iron and vitamin C (enhancing non-heme iron absorption). The American Botanical Council documents use by midwives to treat anemia in pregnant women. No large human RCTs confirm clinical efficacy specifically for anemia.
Nettle has been used traditionally for respiratory complaints including asthma and coughs across multiple ethnomedicinal traditions including Peru and Brazil, as documented by EMA assessment. The antihistamine and mast-cell-stabilizing activity of nettle flavonoids provide a theoretical mechanism. Clinical evidence specific to asthma is absent; the respiratory RCT data pertain to allergic rhinitis, not asthma.
Nettle leaves are rich in calcium, magnesium, silica, vitamin K, and flavonoids—nutrients relevant to bone metabolism. Preclinical data (animal and in vitro) suggest nettle extract promotes osteoblast activity and inhibits osteoclasts, accelerating bone formation. Traditional medicine systems including Moroccan herbalism use nettle for bone and joint disorders. No human clinical trials on bone density endpoints have been identified.
Nettle has a long history of traditional use as a galactagogue (milk-production promoter) across multiple cultures, and it is widely included in commercially available lactation supplement blends. The NIH LactMed database acknowledges the traditional use but notes that only minimal scientific support for a galactagogue effect exists. No scientifically valid clinical trials have confirmed efficacy or safety in nursing mothers.
Nettle has been used traditionally across multiple cultures for eczema and inflammatory skin conditions, as documented by the EMA assessment report on Urtica dioica folium. The anti-inflammatory and antihistamine properties of nettle flavonoids (via mast cell stabilization and cytokine suppression) provide a plausible pharmacological rationale. No clinical trials specifically targeting eczema as a primary endpoint have been identified.
Nettle has been used in traditional and historical medicine across many cultures for the management of fever, documented in ethnobotanical records and historical medical texts. The plant's anti-inflammatory phenolic compounds provide a plausible pharmacological basis. No clinical trials of nettle as an antipyretic in humans have been published.
Stinging nettle (Urtica dioica) contains lignans, phytosterols (including beta-sitosterol), and lectins that may inhibit 5-alpha-reductase and DHT binding at follicular receptors, relevant to androgenetic alopecia. It is identified alongside saw palmetto and pumpkin seed oil as one of the best-supported DHT-related natural options by trichology sources. Traditional European use for scalp and hair conditions spans centuries.
Stinging nettle (Urtica dioica) has a long tradition of use in European herbal medicine for hair loss and scalp health. It contains compounds including beta-sitosterol and sterols that inhibit 5-alpha reductase in vitro. Human clinical trial evidence is limited, but it appears in Commission E and traditional monographs as a scalp-stimulating herb.
Nettle has a long-established traditional use as a hemostatic agent for reducing excessive menstrual flow, documented in ethnobotanical records and herbal monographs across Brazil, Europe, and the Middle East. The astringent tannin content and vitamin K presence provide a pharmacological rationale. No human clinical trials specifically addressing heavy menstrual bleeding as a primary endpoint have been identified.
Stinging nettle (Urtica dioica) has been used in traditional European herbalism for centuries as a blood builder for iron-deficiency anemia and fatigue. It contains non-heme iron, vitamin C, and folate. Clinical trial evidence specifically for IDA is limited; the evidence base is primarily traditional and nutritional.
Stinging nettle (Urtica dioica) is identified in a PMC systematic review as a dietary plant with scientific interest for kidney stone prevention. It is used in European traditional medicine as a diuretic and for urinary tract disorders, approved by German Commission E and ESCOP for urinary tract irrigation therapy. Its diuretic properties increase urine flow, diluting stone-forming minerals, and it has been used in European and Middle Eastern herbal kidney stone protocols.
Nettle (Urtica dioica) is a traditional lymphatic herb frequently combined with dandelion, burdock, and cleavers in lymphatic cleansing preparations. It exerts diuretic and anti-inflammatory effects that help reduce fluid retention and support lymphatic clearance pathways. Nettle is listed in traditional herbal medicine references as an alterative with direct relevance to lymphatic health.
Stinging nettle (Urtica dioica) has centuries of use in European folk medicine and Ayurvedic traditions as a hair tonic to reduce loss and promote growth. In vitro studies show nettle root extract inhibits 5α-reductase and interferes with DHT-receptor binding. A 2018 placebo-controlled study (Pekmezci, n=120) using a multi-herb formula including Urtica dioica root extract showed significantly reduced hair loss in AGA subjects over 6 months.
Stinging nettle (Urtica dioica) is a traditional hemostatic and astringent herb used for nosebleeds, applied topically as a soaked cotton plug or taken as tea. Its tannins promote vasoconstriction of nasal mucosa, and its vitamin K and bioflavonoid content support capillary integrity and coagulation. No clinical trials have specifically evaluated it for epistaxis.
Nettle is used in Moroccan traditional medicine and other ethnomedicinal systems for bone and joint disorders. Its mineral content (calcium, magnesium, silica) and vitamin K are nutritionally relevant to bone health. Animal data suggest osteoblast-stimulating and osteoclast-inhibiting effects. No human clinical trials on osteoporosis prevention have been conducted.
Stinging nettle (Urtica dioica) has been used in European and Middle Eastern traditional medicine as a nutritive tonic during convalescence, providing iron, vitamins A, C, and K, and anti-inflammatory compounds. Traditionally prescribed for debility, anemia, and nutritional deficiency after illness. Some clinical evidence supports anti-inflammatory properties.
Nettle (Urtica dioica) is used in European and North American herbal traditions as a nutritive tonic for postpartum recovery, prized for its high content of iron, calcium, magnesium, and vitamins. It is used to support energy, uterine tone, and lactation, and is referenced by multiple herbalists and integrative practitioners as a postpartum restorative.
Nettle (Urtica dioica, U. urens) leaf is included by the EMA HMPC in approved traditional diuretic herbal tea combinations for minor urinary tract complaints. The herb is used to increase urine production and flush the urinary tract. Root preparations are also studied for lower urinary tract symptoms related to benign prostatic hyperplasia (BPH). Evidence for the leaf is traditional; for the root there is preliminary clinical trial data for BPH-related urinary symptoms.
Stinging nettle (Urtica dioica) herb (not root) is listed by the EMA/HMPC and German Commission E as a traditional diuretic for irrigation therapy in lower urinary tract complaints including UTI support. It increases urine volume, theoretically flushing bacteria from the urinary tract. A 2020 Springer Nature review on natural UTI therapeutics listed nettles as a diuretic botanical with anti-UTI use.
Urtica dioica (stinging nettle) leaf is approved by the German Commission E and the European Scientific Cooperative on Phytotherapy (ESCOP) for use as a diuretic in irrigation therapy for urinary tract conditions and edema. An Iranian clinical trial of 287 patients found nettle tea reduced kidney pain, attributed to its diuretic activity. It is widely used in European traditional herbal medicine for fluid retention.
Stinging nettle (Urtica dioica) leaf is a traditional spring tonic and kidney diuretic used across European herbalism for whole-body cleansing. It supports kidney elimination by promoting urine output and is considered one of the safest kidney tonic diuretics. Nettle is widely included in whole-body cleanse and detox formulations.
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