Parts Used & Where Grown
Nettle is a leafy plant that is found in most temperate regions of the world. The Latin root of Urtica is uro, meaning “I burn,” indicative of the small stings caused by the little hairs on the leaves of this plant that burn when contact is made with the skin. The root and leaves of nettle are used in herbal medicine.
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3 Stars Reliable and relatively consistent scientific data showing a substantial health benefit.
2 Stars Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit.
1 Star For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support.
This supplement has been used in connection with the following health conditions:
Benign Prostatic Hyperplasia
120 mg of root extract (capsules or tablets) twice per day or 2 to 4 ml of tincture three times per day
A concentrated extract made from the roots of the nettle plant may increase urinary volume and flow rate in men with early-stage BPH.
In many parts of Europe, herbal supplements are considered standard medical treatment for BPH. Although herbs for BPH are available without prescription, men wishing to take them should be monitored by a physician.
A concentrated extract made from the roots of the Reference nettle plant may increase urinary volume and the maximum flow rate of urine in men with early-stage BPH.1 It has been successfully combined with both Reference saw palmetto and pygeum to treat BPH in double-blind trials.2 It has also been shown in a double-blind trial, when used by itself, to relieve symptoms of BPH and to improve disease severity.3 An appropriate amount appears to be 120 mg of nettle root extract (in capsules or tablets) twice per day or 2 to 4 ml of tincture three times per day.
Apply stinging nettle under the direction of a qualified healthcare practitioner
Stinging nettle has historically been used for joint pain and has been shown to be safe and effective for relieving the pain of OA.
has historically been used for joint pain. Topical application with the intent of causing stings to relieve joint pain has been assessed in preliminary and double-blind trials. The results found intentional nettle stings to be safe and effective for relieving the pain of OA. The only reported adverse effect is a sometimes painful or numbing rash that lasts 6 to 24 hours.
0.5 to 8 grams daily
Taking nettle leaf may ease symptoms, including sneezing and itchy eyes.
In an isolated double-blind trial, Reference nettle leaf led to a slight reduction in symptoms of hay fever—including sneezing and itchy eyes.4 However, no other research has investigated this relationship. Despite the lack of adequate scientific support, some doctors suggest taking 450 mg of nettle leaf capsules or tablets two to three times per day, or a 2–4 ml tincture three times per day for people suffering from hay fever.
Pregnancy and Postpartum Support
Refer to label instructions
Nettle leaf is rich in calcium and iron and is mildly diuretic. It enriches and increases the flow of breast milk and restores the mother’s energy following childbirth.
Many tonic herbs, which are believed to strengthen or invigorate organ systems or the entire body, can be taken safely every day during pregnancy. Examples include Reference dandelion leaf and root, Reference red raspberry leaf, and Reference nettle. Dandelion leaf and root are rich sources of vitamins and minerals, including Reference beta-carotene, Reference calcium, Reference potassium, and Reference iron. Dandelion leaf is mildly diuretic (promotes urine flow); it also stimulates bile flow and helps with the common digestive complaints of pregnancy. Dandelion root is traditionally used to strengthen and invigorate the liver.5
Nettle leaf is rich in the minerals calcium and iron, is mildly diuretic, and is diuretic. Nettle leaf is rich in the minerals calcium and iron, is and mildly diuretic. Nettle enriches and increases the flow of breast milk and restores the mother’s energy following childbirth.6
Refer to label instructions
Nettle has been used historically as a treatment for arthritis. It is applied topically, with the intent of causing stings to relieve arthritis pain.
The historic practice of applying Reference nettle topically (with the intent of causing stings to relieve arthritis) has been assessed by a questionnaire study.7 The nettle stings were reported to be safe except for causing a sometimes painful, sometimes numbing rash lasting 6 to 24 hours. Further studies are required to determine whether this practice is therapeutically effective.
Urinary Tract Infection
Refer to label instructions
Nettle may relieve UTI symptoms by increasing urinary volume and helping to flush bacteria out of the urinary tract.
Asparagus (Asparagus officinalis), birch (Betula spp.), couch grass (Agropyron repens), goldenrod (Solidago virgaurea), Reference horsetail, Java tea (Orthosiphon stamineus), lovage (Levisticum officinale), parsley (Petroselinum crispum), spiny restharrow (Ononis spinosa), and Reference nettle are approved in Germany as part of the therapy of people with UTIs. These herbs appear to work by increasing urinary volume and supposedly helping to flush bacteria out of the urinary tract.8 Reference Juniper is used in a similar fashion by many doctors. Generally, these plants are taken as tea.
Traditional Use (May Not Be Supported by Scientific Studies)
Nettle has a long history of use. The tough fibers from the stem have been used to make cloth and cooked nettle leaves were eaten as vegetables. From ancient Greece to the present, nettle has been documented for its traditional use in treating Reference coughs, tuberculosis, and arthritis and in stimulating hair growth.
How It Works
How It Works
There has been a great deal of controversy regarding the identity of nettle’s active constituents. Currently, it is thought that polysaccharides (complex sugars) and lectins are probably the active constituents. Test tube studies suggest the leaf has anti-inflammatory actions. This is thought to be caused by nettle preventing the body from making inflammatory chemicals known as prostaglandins.9 Nettle’s root affects hormones and proteins that carry sex hormones (such as testosterone or estrogen) in the human body. This may explain why it helps Reference benign prostatic hyperplasia (BPH).10 Although less frequently used alone like Reference saw palmetto or Reference pygeum, some limited clinical trials suggest benefit of nettle root extract for men with milder forms of BPH.11
Nettle leaf also contains a variety of flavonoids, which may have antihistamine effects. A preliminary trial reported that capsules made from freeze-dried leaves reduced sneezing and itching in people with Reference hay fever.12 Further studies are needed to confirm this finding, however.
The historical practice of intentionally applying nettle topically with the intent of causing stings to relieve arthritis has been assessed by a questionnaire in modern times.13 The results found intentional nettle stings safe, except for a sometimes painful, sometimes numb rash that lasts 6–24 hours. Additional trials are required to determine if this practice is therapeutically effective.
How to Use It
During the Reference allergy season, two to three 300 mg nettle leaf capsules or tablets or 2–4 ml tincture can be taken three times per day. For Reference BPH, 120 mg of a concentrated root extract in capsules can be taken two times per day.14 Many products for BPH will combine nettle root with Reference saw palmetto or Reference pygeum extracts. Intentional stinging with nettles should only be undertaken after consultation with a physician knowledgeable in botanical medicine.
Interactions with Supplements, Foods, & Other Compounds
Interactions with Medicines
Nettle may cause mild gastrointestinal upset in some people. Although allergic reactions to nettle are rare, when contact is made with the skin, fresh nettle can cause a rash secondary to the noted stings.15 Nettle leaf is considered safe for use in Reference pregnancy and breast-feeding.
1. Koch E, Biber A. Pharmacological effects of sabal and urtica extracts as a basis for a rational medication of benign prostatic hyperplasia. Urologe 1994;334:90–5.
2. Metzker H, Kieser M, Hölscher U. Efficacy of a combined Sabal-Urtica preparation in the treatment of benign prostatic hyperplasia (BPH). Urologe B 1996;36:292–300.
3. Safarinejad MR. Urtica dioica for treatment of benign prostatic hyperplasia: a prospective, randomized, double-blind, placebo-controlled, crossover study. J Herb Pharmacother 2005;5:1–11.
4. Mittman P. Randomized double-blind study of freeze-dried Urtica diocia in the treatment of allergic rhinitis. Planta Med 1990;56:44–7.
5. Gladstar R. Herbal Healing for Women. New York: Simon and Schuster, 1993, 176.
6. Gladstar R. Herbal Healing for Women. New York: Simon and Schuster, 1993, 177.
7. Randall C, Meethan K, Randall H, Dobbs F. Nettle sting of Urtica dioica for joint pain—an exploratory study of this complementary therapy. Compl Ther Med 1999;7:126–31.
8. Blumenthal M, Busse WR, Goldberg A, et al. (eds). The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Austin: American Botanical Council and Boston: Integrative Medicine Communications, 1998, 428.
9. Obertreis B, Giller K, Teucher T, et al. Antiphlogistic effects of Urtica dioica folia extract in comparison to caffeic malic acid. Arzneimittelforschung 1996;46:52–6.
10. Hirano T, Homma M, Oka K. Effects of stinging nettle root extracts and their steroidal components on the Na+,K+-ATPase of the benign prostatic hyperplasia. Planta Med 1994;60:30–3.
11. Vontobel H, Herzog R, Rutishauser G, Kres H. Results of a double-blind study on the effectiveness of ERU (extractum radicis urticae) capsules in conservative treatment of benign prostatic hyperplasia. Urologe 1985;24:49–51 [in German].
12. Mittman P. Randomized, double-blind study of freeze-dried Urtica dioica in the treatment of allergic rhinitis.Planta Med 1990;56:44–7.
13. Randall C, Meethan K, Randall H, Dobbs F. Nettle sting of Urtica dioica for joint pain--an exploratory study of this complementary therapy. Compl Ther Med 1999;7:126–31.
14. Brown D, Austin S, Reichert R. Benign Prostatic Hyperplasia and Prostate Cancer Prevention. Seattle: NPRC, 1997, 9–10.
15. Blumenthal M, Busse WR, Goldberg A, et al. (eds). The Complete Commission E Monographs: Therapeutic Guide to Herbal Medicines. Boston, MA: Integrative Medicine Communications, 1998, 216–7.
Last Review: 11-07-2012
Copyright © 2012 Aisle7. All rights reserved. Aisle7.com
The information presented in Aisle7 is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires June 2013.