Home Ingredients Nettle Root (Urtica dioica)
Men's HealthKidney/Urinary TractProstate Health

Nettle Root (Urtica dioica)

Urtica dioica
Evidence Level
Moderate
2 Clinical Trials
5 Documented Benefits
3/5 Evidence Score

Stinging nettle root (distinct from leaf, which has different uses) is studied for prostate health, normal urinary flow and comfort (including in men with BPH), and male hormone modulation. Critical distinction from nettle leaf (used for allergies, joint pain, anti-inflammatory). Nettle root binds sex hormone-binding globulin (SHBG) — theoretically increasing free testosterone. Component of prostate formulas alongside saw palmetto, pygeum, beta-sitosterol.

Studied Dose 300-600 mg/day standardized extract; combined with saw palmetto in many formulas (typically 320 mg saw palmetto + 240 mg nettle root)
Active Compound Lignans, lectins (UDA — Urtica dioica agglutinin), beta-sitosterol, polysaccharides

Benefits

Prostate & Urinary Comfort

Multiple trials report nettle root supports prostate comfort and urinary flow (studied in men with BPH) versus placebo. Often combined with saw palmetto (Prostagutt forte® / pro 160/120 — 160 mg saw palmetto + 120 mg nettle root) — major European phytotherapy product.

Supported by Trial 1, Trial 2

SHBG Binding (Free Testosterone Theoretical)

Nettle root lignans bind to sex hormone-binding globulin (SHBG) — theoretically displacing testosterone and increasing free (active) testosterone. Mechanism cited for testosterone-supportive marketing. Clinical translation modest.

Supported by Trial 1, Trial 2

5-Alpha-Reductase Inhibition (Modest)

Laboratory studies suggest nettle root may modestly inhibit 5-alpha-reductase (the enzyme that forms DHT), though human confirmation is limited. Component of mechanism for BPH benefits.

Supported by Trial 1, Trial 2

Aromatase Inhibition (Modest)

Laboratory (in vitro) studies suggest modest aromatase inhibition — reducing testosterone-to-estrogen conversion — but whether this occurs at supplement doses in humans is unproven.

Urinary Symptom Improvement

Beyond BPH, may help functional urinary symptoms — frequency, urgency, nocturia. Used in some traditions for general urinary support.

Supported by Trial 1, Trial 2

Mechanism of action

1

SHBG Binding

Nettle root lignans bind SHBG with significant affinity in vitro — theoretically displacing testosterone and increasing free testosterone. In vivo significance debated; protein binding alterations have complex pharmacokinetic effects.

2

5-Alpha-Reductase Modulation

Laboratory evidence suggests modest 5-alpha-reductase modulation, which may lower DHT formation; this is one proposed mechanism for its prostate-comfort effects, though its clinical contribution in humans is not established.

3

Anti-Inflammatory in Prostate Tissue

Reduces inflammation in prostatic tissue — relevant for BPH (which has inflammatory component) and chronic prostatitis.

4

UDA Lectin Effects

Urtica dioica agglutinin (UDA) is a lectin with multiple cellular effects including immune modulation. Significance in supplementation context unclear.

Clinical trials

1
Nettle Root + Saw Palmetto (Prostagutt) for BPH

Clinical trial of nettle root + saw palmetto combination (pro 160/120) vs placebo in 257 BPH patients for 24 weeks.

257 BPH patients.

Significant improvement in IPSS (International Prostate Symptom Score), urinary flow, residual urine vs placebo. Combined product limits attribution to nettle root alone. One positive placebo-controlled combination trial; because it combines saw palmetto and nettle root, the contribution of nettle root alone cannot be isolated.

2
Nettle Root for BPH

Clinical trial of nettle root extract alone vs placebo in 620 BPH patients for 6 months.

620 BPH patients.

Significant improvement in BPH symptoms, urinary flow, post-void residual vs placebo. Supports standalone nettle root for urinary symptoms in this single trial, pending independent replication.

Side effects and drug interactions

Common Potential side effects

Generally well-tolerated.
Mild GI distress.
Headache rare.
Skin reactions / rash rare.
Allergic reactions to nettle.
Diarrhea at high doses.
Hypotension at high doses (modest).

Important Drug interactions

Diabetes medications — modest hypoglycemic effect; monitor.
Antihypertensives — modest additive effect.
Anticoagulants — theoretical bleeding risk; minor.
Lithium — nettle's mild diuretic effect could theoretically affect lithium levels; monitor.
Hormone-sensitive conditions — theoretical effects; consult oncologist.
Saw palmetto — synergistic for prostate (commonly combined intentionally).

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Frequently asked questions about Nettle Root (Urtica dioica)

What is nettle root used for?

Nettle root (distinct from nettle leaf) is used mainly for prostate health and urinary symptoms of an enlarged prostate (BPH), often combined with saw palmetto or pygeum. Nettle leaf is used more for allergies and as a nutritive.

What is the difference between nettle root and nettle leaf?

Nettle root is used for prostate and urinary support (BPH), while nettle leaf is used for seasonal allergies, joint comfort, and as a mineral-rich nutritive tea. They are different parts with different uses.

How much nettle root should I take?

BPH studies commonly use about 120 mg of nettle root extract two to three times daily, often within prostate-support blends. Follow product labeling and give it several weeks.

Is nettle root safe?

It is generally well tolerated; mild digestive upset can occur. As with any prostate supplement, have prostate symptoms evaluated by a doctor. It may mildly affect blood sugar and blood pressure, so monitor if relevant.

What is Nettle Root?

Stinging nettle root (distinct from leaf, which has different uses) is studied for prostate health, normal urinary flow and comfort (including in men with BPH), and male hormone modulation. Critical distinction from nettle leaf (used for allergies, joint pain, anti-inflammatory).

What is the recommended dosage of Nettle Root?

The clinically studied dose is 300-600 mg/day standardized extract; combined with saw palmetto in many formulas (typically 320 mg saw palmetto + 240 mg nettle root) Always follow the product label and check with a healthcare provider for personal advice.

Is Nettle Root safe, and does it have side effects?

For most healthy adults, Nettle Root is well tolerated at studied doses. Reported effects can include: Generally well-tolerated. Mild GI distress. It may also interact with some medications. Nettle Root is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Nettle Root interact with any medications?

Possible interactions include: Diabetes medications — modest hypoglycemic effect; monitor. Antihypertensives — modest additive effect. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Nettle Root?

NutraSmarts rates the evidence for Nettle Root as Moderate (3 out of 5). It is backed by 2 clinical trials and 2 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(2 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Akbar Karami A, Sheikhsoleimani M, Reza Memarzadeh M, et al. Urtica Dioica Root Extract on Clinical and Biochemical Parameters in Patients with Benign Prostatic Hyperplasia, Randomized Controlled Trial. Pak J Biol Sci. 2020;23(10):1338-1344..PubMedUsed to support: Randomized trial of nettle (Urtica dioica) root extract on benign prostatic hyperplasia parameters.
  2. Safarinejad MR Urtica dioica for treatment of benign prostatic hyperplasia: a prospective, randomized, double-blind, placebo-controlled, crossover study. Journal of Herbal Pharmacotherapy. 2005;5(4):1-11..PubMedUsed to support: The largest standalone nettle-root trial: a randomized, double-blind, placebo-controlled crossover study in 620 men, where 6 months of nettle-root extract improved IPSS symptom scores, urinary flow, and post-void residual versus placebo. Supports the standalone (non-combination) trial card.