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Men's 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 used for benign prostatic hyperplasia (BPH), male hormone modulation, and urinary symptoms. 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

BPH Symptom Improvement

Multiple trials (Schneider 2004, Lopatkin 2005) show nettle root improves BPH symptoms vs 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)

Nettle root modestly inhibits 5-alpha-reductase — same enzyme targeted by finasteride; reduces DHT formation. Component of mechanism for BPH benefits.

Supported by Trial 1, Trial 2

Aromatase Inhibition (Modest)

Some evidence for modest aromatase inhibition — reducing testosterone-to-estrogen conversion. Relevant for some men's health applications.

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

Modestly inhibits 5-alpha-reductase, reducing DHT formation. Less potent than finasteride but contributes to BPH effects.

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 — Lopatkin 2005
PubMed

RCT 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. Established Prostagutt as evidence-based European BPH product.

2
Nettle Root for BPH — Safarinejad 2005
PubMed

RCT 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. Established standalone nettle root efficacy.

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 the recommended dosage of Nettle Root (Urtica dioica)?

The clinically studied dose for Nettle Root (Urtica dioica) 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 product labeling and consult a healthcare provider for personalized dosing recommendations.

What is Nettle Root (Urtica dioica) used for?

Nettle Root (Urtica dioica) is studied for bph symptom improvement, shbg binding (free testosterone theoretical), 5-alpha-reductase inhibition (modest). Multiple trials (Schneider 2004, Lopatkin 2005) show nettle root improves BPH symptoms vs placebo. Often combined with saw palmetto (Prostagutt forte® / PRO 160/120 — 160 mg saw palmetto + 120 mg nettle root) — major European phytotherapy product.

Are there side effects from taking Nettle Root (Urtica dioica)?

Reported potential side effects may include: Generally well-tolerated. Mild GI distress. Always consult a healthcare provider before starting any new supplement, especially if you have underlying conditions or take medications.

Does Nettle Root (Urtica dioica) interact with medications?

Known drug interactions may include: Diabetes medications — modest hypoglycemic effect; monitor. Antihypertensives — modest additive effect. Consult a pharmacist or healthcare provider if you take prescription medications.

Is Nettle Root (Urtica dioica) good for men's health?

Yes, Nettle Root (Urtica dioica) is researched for Men's Health support. Some evidence for modest aromatase inhibition — reducing testosterone-to-estrogen conversion. Relevant for some men's health applications.