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Stinging Nettle Root supplement
Herbal Extract

Stinging Nettle Root: Benefits, Dosage, Forms & Research

Herbal Extract

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

TL;DR — Quick Answer

Stinging nettle root extract may increase free testosterone by binding SHBG and is an approved phytotherapy for BPH in several European countries. At 300-600mg daily, it reduces urinary symptoms and is commonly combined with saw palmetto. Evidence is moderate for prostate health.

Key Facts

What it is
Root extract from Urtica dioica containing lectins, lignans, and sterols that bind SHBG and support prostate health
Primary benefits
  • Binds SHBG (may increase free testosterone)
  • Reduces BPH urinary symptoms
  • Anti-inflammatory effects in prostate tissue
  • Synergistic with saw palmetto for prostate health
  • Approved phytotherapy for BPH in Germany and Austria
Typical dosage
300-600mg root extract daily
Evidence level
Moderate
Safety profile
Generally Safe

What the Research Says

Stinging nettle root has a well-established evidence base in European phytotherapy, where it is an approved treatment for BPH in Germany and Austria (Commission E monograph). Safarinejad (2005) published the largest randomized controlled trial, enrolling 620 men with BPH who received either 600mg nettle root extract or placebo daily for 6 months. The nettle group showed significant improvements in IPSS score (from 19.8 to 11.8 vs. 19.2 to 17.7 for placebo), maximum urinary flow rate, and post-void residual volume. Lopatkin et al. (2005) studied the fixed combination of saw palmetto 160mg + nettle root 120mg (PRO 160/120) in 257 men over 48 weeks and found it comparable to finasteride 5mg for IPSS improvement with fewer sexual side effects. The SHBG-binding mechanism was characterized by Schottner et al. (1997), who identified specific lignans (secoisolariciresinol and its derivatives) that compete with testosterone for SHBG binding sites in vitro.

Benefits of Stinging Nettle Root

  • SHBG binding — in vitro and animal studies show that nettle root lignans bind to sex hormone-binding globulin, potentially displacing testosterone and increasing the free (bioavailable) fraction; Schottner et al. (1997) identified the specific lignan compounds responsible for SHBG binding
  • BPH symptom relief — Safarinejad (2005) conducted a 6-month double-blind RCT in 620 men with BPH and found that 600mg nettle root extract daily significantly improved IPSS scores, urinary flow rate, and post-void residual volume compared to placebo
  • Prostate 5-alpha-reductase inhibition — nettle root contains beta-sitosterol and other phytosterols that inhibit 5-alpha-reductase in prostate tissue, reducing local DHT production
  • Anti-inflammatory properties — the extract inhibits aromatase and reduces inflammatory mediators in prostate tissue, including prostaglandin E2 and leukotriene B4
  • Combination therapy — Lopatkin et al. (2005) demonstrated that a fixed combination of saw palmetto 160mg + nettle root 120mg (PRO 160/120) was as effective as finasteride for BPH symptoms over 48 weeks
Did you know?

Stinging nettle root has a well-established evidence base in European phytotherapy, where it is an approved treatment for BPH in Germany and Austria (Commission E monograph).

Forms of Stinging Nettle Root

FormBioavailabilityBest For
Standardized Root Extract (1-2% plant sterols)Moderate-HighBPH and prostate health — matches the form used in European clinical trials and approved phytotherapies
Root Extract with Saw Palmetto (combination)Moderate-HighSynergistic prostate support — the PRO 160/120 combination has been studied in multiple RCTs
Dried Root PowderModerateTraditional preparation — less concentrated than standardized extracts

Dosage Recommendations

General recommendation: 300-600mg standardized root extract daily

Timing: With meals, divided into 2 doses (morning and evening) • Take with food for best absorption.

Dosage by Condition

ConditionRecommended DoseEvidence
BPH symptom relief600mg root extract daily in 2 divided dosesModerate
SHBG binding / free testosterone300-600mg dailyEmerging
Combination with saw palmetto120mg nettle root + 160mg saw palmetto (PRO 160/120)Moderate

Upper limit: 1200mg daily has been used in studies; standard therapeutic dose is 600mg

Side Effects and Safety

Safety profile: Generally Safe

Potential Side Effects

  • Mild GI discomfort (upset stomach, diarrhea) — uncommon at standard doses
  • Sweating (occasionally reported)
  • Allergic skin reaction in individuals sensitive to nettle (rare with root extract)
  • Well-tolerated in clinical trials — side effect incidence comparable to placebo

Drug & Supplement Interactions

  • Blood pressure medications — nettle may have mild diuretic and hypotensive effects; monitor blood pressure
  • Diabetes medications — may have mild hypoglycemic effects; monitor blood sugar
  • Blood thinners (warfarin) — nettle leaf (not root) contains vitamin K; root extract is less concerning but inform physician
  • Finasteride/dutasteride — potential additive 5-alpha-reductase inhibition; may be beneficial but discuss with urologist
Check Stinging Nettle Root interactions with other supplements →
BenefitsDosage GuideSide EffectsTypes & FormsResearchFAQ

Related Conditions

Prostate Health

Related Supplements

Saw PalmettoPygeumZinc

Frequently Asked Questions

Does nettle root really increase free testosterone?

In vitro studies demonstrate that nettle root lignans bind SHBG and can displace testosterone from SHBG binding sites, which would theoretically increase free (bioavailable) testosterone. However, clinical studies measuring actual free testosterone changes from nettle root supplementation alone are limited. The SHBG-binding effect is well-documented in laboratory settings but clinical quantification in humans needs more research. Most clinical trials have focused on prostate symptom outcomes rather than hormone levels.

Is nettle root the same as nettle leaf?

No, they are different parts of the same plant with different uses. Nettle root (Urtica dioica radix) is used for prostate health, SHBG binding, and BPH symptoms. Nettle leaf (Urtica dioica folium) is used for allergies, inflammation, and joint pain, and contains different active compounds (including histamine and vitamin K). When shopping for men's health benefits, specifically look for "nettle root" extract, not "nettle leaf" or "stinging nettle" (which usually refers to the leaf).

Can I combine nettle root with saw palmetto?

Yes, this is one of the best-studied herbal combinations for prostate health. The PRO 160/120 formulation (saw palmetto 160mg + nettle root 120mg) has been studied in multiple RCTs and was found comparable to finasteride for BPH symptom relief with fewer side effects. Many European urologists recommend this combination as a first-line phytotherapy before considering pharmaceutical options.

References

  1. (). Urtica dioica for treatment of benign prostatic hyperplasia: a prospective, randomized, double-blind, placebo-controlled, crossover study. Journal of Herbal Pharmacotherapy. DOI
  2. (). Long-term efficacy and safety of a combination of sabal and urtica extract for lower urinary tract symptoms — a placebo-controlled, double-blind, multicenter trial. World Journal of Urology. DOI
  3. (). Lignans from the roots of Urtica dioica and their metabolites bind to human sex hormone binding globulin (SHBG). Planta Medica. DOI