Stinging Nettle
Urtica dioica (Stinging Nettle)
Stinging nettle (Urtica dioica) is a flowering plant used medicinally for centuries, primarily studied for its effects on benign prostatic hyperplasia (BPH), allergic rhinitis, and inflammatory conditions including arthritis. The root extract is most commonly used for prostate health, while the leaf extract is used for allergy relief and anti-inflammatory support. It contains a diverse array of bioactive compounds including lectins, polysaccharides, sterols, and flavonoids.
Mechanism of Action
Nettle root inhibits sex hormone-binding globulin (SHBG) binding to its receptor and modulates 5-alpha-reductase activity, contributing to its effects on prostate tissue proliferation. Leaf extracts suppress pro-inflammatory cytokines including TNF-alpha, IL-1, and NF-kB signaling pathways, explaining anti-inflammatory and antihistamine properties. Additionally, nettle contains compounds that inhibit the enzyme aromatase and interact with androgen receptors, which may influence hormonal balance.
Evidence by Health Goal(17 goals)
Dosing Protocols
With meals to minimize gastrointestinal discomfort
Standardized root extract is preferred for BPH and hormonal support; standardized leaf extract for allergy and anti-inflammatory use. Most clinical trials used 300mg twice daily for BPH outcomes.
Apply directly to affected joint or skin area
Topical application of freeze-dried leaf preparations has been studied for osteoarthritis pain relief; the mild sting (urticaria) of fresh plant application has folk use but is not standardized.
Safety & Side Effects
Stinging nettle is generally well-tolerated at standard doses and has a long history of use with a favorable safety profile in healthy adults; however, it should be avoided during pregnancy due to potential uterotonic effects, and caution is warranted in individuals with diabetes, low blood pressure, or those on anticoagulant or diuretic medications.
Possible Side Effects
- !Gastrointestinal discomfort including nausea or stomach upset at higher doses
- !Mild diuretic effect leading to increased urination frequency
- !Allergic skin reactions or contact dermatitis with topical use
- !Mild fluid retention or edema reported in some users
- !Hypoglycemia risk at high doses due to modest blood glucose-lowering effects
- !Mild hypotension, particularly in individuals on antihypertensive therapy
- !Uterine contractions — reported in animal studies, caution in pregnancy
Interactions
- -May potentiate anticoagulant medications (e.g., warfarin) due to vitamin K content in leaf extracts — monitor INR closely
- -Can enhance blood pressure-lowering effects of antihypertensive drugs — risk of additive hypotension
- -May have additive blood glucose-lowering effects with diabetic medications — monitor blood sugar levels
- -May enhance diuretic effects of loop or thiazide diuretics — risk of electrolyte imbalance
- -Potential additive anti-inflammatory effects with NSAIDs — may allow dose reduction but also adds GI risk
Cost & Where to Buy
Widely available over-the-counter; cost varies based on whether root or leaf extract is used, standardization level, and brand quality. Bulk powders are cheapest; standardized capsules from reputable brands run higher.
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