Nettle Root
Urtica dioica (root)
The root extract of stinging nettle, distinct from nettle leaf, studied for prostate health (BPH), hormonal balance, and anti-inflammatory effects.
What is Nettle Root?
Nettle root (Urtica dioica radix) is pharmacologically distinct from nettle leaf. While the leaf is used primarily as an anti-inflammatory and nutritive herb, the root has specific activity on prostate tissue and hormonal pathways. It is one of the most commonly prescribed herbal remedies for benign prostatic hyperplasia (BPH) in Europe, often combined with saw palmetto, and is included in multiple European pharmacopoeias.
Known Health Benefits
How It Works
Nettle root lectins (UDA — Urtica dioica agglutinin) bind to SHBG, reducing its binding of testosterone and dihydrotestosterone (DHT), thereby increasing free hormone availability while reducing hormonal stimulation of prostate tissue. Beta-sitosterol inhibits 5α-reductase (reducing DHT conversion) and has direct anti-inflammatory effects on prostate tissue. The root also inhibits aromatase, reducing estrogen formation which contributes to prostate growth in aging men. Scopoletin provides additional anti-inflammatory activity.
What Research Says
A 2005 Cochrane-style review identified multiple RCTs supporting nettle root for BPH symptoms, particularly in combination with saw palmetto (PRO 160/120 extract). A 2013 RCT of 620 BPH patients showed significant improvement in IPSS (International Prostate Symptom Score), urinary flow rate, and post-void residual volume with nettle root extract. The combination of nettle root + saw palmetto has shown efficacy comparable to finasteride (Proscar) in head-to-head trials, with fewer sexual side effects.
Active Compounds
Polysaccharides, lectins, sterols (beta-sitosterol), phenols, scopoletin
Forms & Bioavailability
Beta-sitosterol and other phytosterols are moderately absorbed orally (5–10%). Lectins may act locally in the GI tract or after partial absorption. The root must be prepared as a decoction (boiled) rather than infusion (steeped) for tea preparation, as the active compounds require heat extraction. Standardized extracts provide more consistent dosing.
Dosage Guidance
| Use Case | Dosage |
|---|---|
| BPH symptom relief | 240–600 mg standardized extract daily |
| SHBG modulation | 300–600 mg daily |
| Urinary flow support | 400–1200 mg daily |
| Root decoction | 3–6 g dried root simmered 10 min |
Always consult a healthcare provider for personalized dosing.
Potential Side Effects
Generally well tolerated; mild GI effects
Who Should Avoid It
- Prostate cancer (see urologist — BPH and cancer can coexist; supplements should not delay diagnosis)
- Concurrent finasteride or dutasteride (similar mechanism; combined effect unpredictable)
- Diabetes medications (may have additive hypoglycemic effects)
- Anticoagulant therapy (theoretical interaction via vitamin K content)
Pregnancy & Lactation
Not applicable for the primary indication (prostate health). If used by women for hormonal purposes, insufficient safety data exists for pregnancy and lactation. Generally avoided during pregnancy.
Known Drug Interactions
May interact with diuretics, blood thinners, and diabetes medications
Evidence Classification
Supported by cohort studies, case-control studies, or multiple observational studies with consistent findings.
Frequently Asked Questions
What's the difference between nettle root and nettle leaf?
They contain different active compounds and have different uses. Nettle root is used primarily for prostate health (BPH) and hormonal balance, containing lectins and sterols that affect SHBG and 5α-reductase. Nettle leaf is used as a nutritive (rich in iron, silica), anti-inflammatory (for allergies, arthritis), and diuretic. Do not substitute one for the other.
Can nettle root replace finasteride for BPH?
A head-to-head trial of nettle root + saw palmetto vs. finasteride showed comparable efficacy for BPH symptoms with fewer sexual side effects. However, finasteride also reduces prostate size (which herbs do not significantly), which may be important for larger prostates. Discuss with your urologist — herbs may be sufficient for mild-moderate BPH.
How long does nettle root take to work for prostate symptoms?
Noticeable improvement in urinary symptoms typically begins within 4–8 weeks, with maximum benefit at 6–12 months of continuous use. Unlike finasteride which takes months to reduce prostate volume, nettle root's symptom relief comes primarily from reducing inflammation and improving urodynamics.
Does nettle root increase testosterone?
Not directly. Nettle root modulates SHBG, the protein that binds testosterone in the blood. By reducing SHBG binding, it can increase free (bioavailable) testosterone without increasing total testosterone production. This mechanism is particularly relevant for aging men with rising SHBG levels.
Should I combine nettle root with saw palmetto?
Yes, this is the most evidence-supported combination for BPH. The PRO 160/120 extract (160 mg saw palmetto + 120 mg nettle root) has been studied in large clinical trials. The combination addresses multiple pathways: saw palmetto primarily targets 5α-reductase while nettle root addresses SHBG, inflammation, and aromatase.
References
- Randomized, double-blind study of nettle root extract (Urtica dioica) in benign prostatic hyperplasia. Safarinejad MR. J Herb Pharmacother (2005)View study
- Combined sabal and urtica extract compared with finasteride in men with benign prostatic hyperplasia. Sökeland J. BJU Int (2000)View study
- Urtica dioica for treatment of benign prostatic hyperplasia: a prospective, randomized, double-blind, placebo-controlled, crossover study. Ghorbanibirgani A, Khalili A, Zamani L. Iran Red Crescent Med J (2013)View study
- Interaction of a standardized nettle root extract with sex hormone binding globulin in vitro and in vivo. Schöttner M, Gansser D, Spiteller G. Planta Med (1997)View study
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This entry is for educational purposes only. It is not medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement regimen, especially if you take medications or have health conditions.