Nettle (Urtica) Leaf Extract, Allergic Rhinitis and BPH Multi-Target 2025 Clinical
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Nettle (Urtica) Leaf Extract, Allergic Rhinitis and BPH Multi-Target 2025 Clinical

By Sophie · · Phytotherapy Research 2025
KO | EN

Nettle (Urtica dioica) leaf extract 600 mg/day 8 weeks meaningfully improved 90 allergic rhinitis patient symptoms and 50 BPH (benign prostatic hyperplasia) patient symptoms per 2025 clinical trial. One plant targets allergy and androgen simultaneously.

Phytotherapy Research 2025 RCT divided into two groups, supplemented nettle leaf extract 600 mg/day for 8 weeks. Allergic rhinitis group: nasal congestion, sneezing, runny nose score -47%, partial allergen IgE reduction. BPH group: IPSS (International Prostate Symptom Score) -28%, nocturia frequency reduction.

What is Nettle

Nettle (Urtica dioica) is an Urticaceae perennial. “Stinging Nettle.” Native to Europe, Asia, North America. Leaf surface needle-like spines sting on touch → safe when blanched or boiled.

Active matrix:

  • Quercetin, kaempferol: Flavonoids, antihistamine
  • Serotonin, histamine, acetylcholine: In stings (heat-inactivated)
  • Formic acid: Sting component
  • Beta-sitosterol: Partial 5α-reductase inhibition
  • Lectins: Immune modulation
  • Calcium, iron, vitamin K: Rich

2,000+ year European traditional medicine + food use. Part of Greek Hippocrates prescriptions. UK/Scotland spring vegetable.

Multi-Target Mechanism

1. Antihistamine (allergy):

  • Quercetin stabilizes mast cells → histamine secretion inhibition
  • Histamine H1 receptor partial antagonism
  • Rhinitis/conjunctivitis support

2. 5α-reductase inhibition (BPH/women’s hair):

  • Beta-sitosterol partially blocks testosterone → DHT conversion
  • BPH symptom reduction
  • Women’s androgenic alopecia (AGA) support (some clinical)

3. Anti-inflammatory:

  • NF-κB inhibition
  • Osteoarthritis pain support

4. Diuretic action:

  • Mild diuretic → BPH/urinary support

5. Mineral support:

  • Iron (15 mg/100g dried leaves) + calcium + vitamin K rich
  • Supports mineral deficiency in general diet

Clinical Data

  • Phytotherapy Research 2025 RCT 140 8 weeks: Allergic rhinitis -47%, BPH IPSS -28%
  • Meta-analysis 7 RCTs (2023): Consistent allergic rhinitis effect
  • Germany clinical 2024 RCT 100 12 weeks: Osteoarthritis pain -22%
  • US clinical: Women’s androgenic alopecia (AGA) support effect (some)

Korean Market

Dietary forms:

  • Dried nettle tea: 100g 8,000~15,000 won, 5~10 min in boiling water
  • Fresh young leaves: Some farms/imports, blanch like spinach
  • Powder: Add to smoothie/soup

Supplements:

  • Standardized extract capsule 300~600 mg twice daily 25,000~50,000 won
  • Freeze-dried leaf capsule
  • Root extract (BPH target)

Cautions

  • Pregnancy: Uterine stimulation possible, avoid
  • Lactation: Some lactation support use, dietary safe
  • Anticoagulants (warfarin): Vitamin K content → may reduce drug effect, physician evaluation
  • BP/diabetes drugs: Mild effect, synergy possible
  • Diuretic combination: Synergy electrolyte deficiency
  • Direct fresh leaf handling: Sting (use gloves)
  • Some allergy

Synergy Matrix

  • Quercetin supplement: Antihistamine synergy
  • Vitamin C: Mast cell stabilization synergy
  • Butterbur + bromelain: Allergy matrix
  • Saw palmetto: 5α-reductase dual (BPH)
  • Fenugreek (L23): Androgen modulation dual

Consumer Message

Antihistamines (Claritin, Zyrtec) are first-line for allergic rhinitis but with drowsiness/dry mouth side effects + long-term concerns. Nettle offers natural antihistamine option. Matrix with saw palmetto for BPH. Some support for women’s hair loss. Avoid in pregnancy, anticoagulant physician evaluation. Dietary tea + supplement matrix from spring allergy season.