Stinging nettle has two entirely different clinical applications depending on which PART is used: ROOT extract for BPH/prostate (binds SHBG and 5-alpha reductase) and LEAF extract for allergies (anti-histamine). Our research shows the root has moderate evidence for BPH symptom improvement (a German trial found comparable improvement to finasteride in mild BPH), while the leaf freeze-dried extract reduced allergy symptoms by 58% in a crossover trial. These are pharmacologically distinct — the root contains lignans (anti-androgenic) while the leaf contains histamine-modulating compounds.
ROOT: Nettle root lignans (secoisolariciresinol, 3,4-divanillyltetrahydrofuran) competitively bind to SHBG, preventing SHBG from binding testosterone (increasing free testosterone). The root also inhibits 5-alpha reductase (reducing DHT) and aromatase (reducing estrogen conversion). This dual anti-androgenic + free testosterone-increasing profile makes it useful for BPH. LEAF: Contains histamine (paradoxically), quercetin, and other flavonoids that modulate mast cell degranulation and histamine release. Freeze-drying preserves these compounds. The anti-allergy mechanism may involve lectins that bind to IgE receptors, preventing mast cell activation.
Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.