Stinging Nettle

bacteria(2E,4E)-hexa-2,4-dienoic acid

What is it

Stinging nettle (Urtica dioica) is a herbaceous perennial plant covered with fine stinging hairs that release irritating compounds on contact with skin. When processed (cooked, dried, or extracted), it is safe to consume and has been used since ancient times for allergies, joint pain, urinary issues, and as a nutritious food.

How it works

Stinging nettle contains a complex mix of compounds in different plant parts. The leaves contain flavonoids, chlorophyll, carotenoids, vitamins, minerals (iron, calcium, magnesium), and trace amines including histamine and serotonin. The roots contain lignans, sterols (particularly beta-sitosterol), polysaccharides, and other compounds. Different preparations target different uses based on plant part. For seasonal allergies (allergic rhinitis), freeze-dried nettle leaf has been studied for mild antihistamine and anti-inflammatory effects. The mechanism may involve direct interaction with histamine receptors and effects on inflammatory mediators, though the exact pathway is not fully characterized. For benign prostatic hyperplasia (BPH), nettle root has been studied alone and in combination with saw palmetto. Proposed mechanisms include inhibition of testosterone-binding to sex hormone binding globulin and effects on prostate cell proliferation pathways. Joint pain applications draw on anti-inflammatory effects documented in laboratory and small clinical studies.

Evidence for 5 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Nutritional support

Grade A

Strong evidence

Stinging nettle leaf is highly nutritious, providing meaningful amounts of vitamins, minerals (iron, calcium, magnesium), and protein when consumed as food.

Benign prostatic hyperplasia (BPH)

Grade B

Good evidence

Multiple trials of nettle root, alone and in combination with saw palmetto, show modest improvement in BPH symptoms including urinary flow and frequency. Effects are smaller than alpha-blockers but better tolerated for some users.

Seasonal allergies (allergic rhinitis)

Grade C

Moderate evidence

Some trials of freeze-dried nettle leaf suggest modest relief of allergic rhinitis symptoms. Evidence is limited but the effect is supported by traditional use and plausible mechanisms.

Osteoarthritis and joint pain

Grade C

Moderate evidence

Some small trials suggest possible benefit for joint pain, including topical use of fresh nettle (urtication) for inflammatory joint pain. Evidence quality is mixed.

Mild diuretic effects

Grade C

Moderate evidence

Nettle leaf has documented mild diuretic activity, useful for mild edema.

5 commercial forms

Freeze-dried leaf capsules

Preserves compounds for allergy applications

Most-studied form for seasonal allergies. Capsules typically 300 mg.

Nettle root extract

Specifically for BPH applications

Used alone or combined with saw palmetto for prostate health.

Dried leaf (tea)

Traditional preparation

Nutritious tea with mild diuretic effects.

Fresh cooked leaves

Whole-food form; cooking destroys sting

Used in soups, pesto, and as a cooked green vegetable.

Liquid extract / tincture

Alcohol-based extraction

Used in herbalist preparations.

Dosage

There is no established RDA. For seasonal allergies, freeze-dried nettle leaf is typically dosed at 300 mg one to three times daily during allergy season. For BPH, nettle root extract is commonly dosed at 240 to 600 mg per day, often combined with saw palmetto. Traditional preparations use 1 to 4 grams of dried leaf per day as a tea. Nettle leaf can also be eaten cooked as a vegetable.

When and how to take it

For seasonal allergies, take nettle leaf at the onset of symptoms and continue throughout allergy exposure; freeze-dried capsules typically taken at the start of pollen season. For BPH, take nettle root daily over weeks to months. Nettle leaf as a food can be incorporated into meals without specific timing concerns. Take supplements with or without food.

Food sources

Food	Amount	%DV
Cooked nettle leaves	1 cup cooked	—
Nettle tea	1-2 teaspoons dried leaf per cup	—
Nettle pesto or soup	Variable	—

Safety

Stinging nettle in cooked or processed forms is generally well tolerated and is widely consumed as food. Mild gastrointestinal upset is the most common side effect of supplements. Fresh nettle plants cause significant skin irritation on contact due to formic acid and other compounds in the stinging hairs; this is harmless but uncomfortable and disappears within a day. There is no established Tolerable Upper Intake Level.

Who should be cautious

Pregnant and breastfeeding women should consult a clinician before extended supplement use, though cooked nettle as a food is generally considered safe. People with kidney disease should use caution due to diuretic effects. People on warfarin should monitor INR (high vitamin K content). People with diabetes should monitor blood glucose. Discontinue at least two weeks before surgery.

Interactions

Nettle may potentiate effects of diuretics. May affect blood glucose, requiring monitoring in people on diabetes medications. May potentiate antihypertensive medications. May affect anticoagulants due to high vitamin K content (especially in fresh leaves). Possible interactions with lithium (theoretical, due to diuretic effects). May enhance the effects of sedatives.

Frequently asked questions

Does nettle really help allergies?⌄

Some trials of freeze-dried nettle leaf suggest modest relief of allergic rhinitis symptoms. Evidence is limited but the safety profile is favorable, making it a reasonable option to try.

How do I cook fresh nettles safely?⌄

Wear gloves when handling fresh nettles. Cooking (boiling, steaming, or sauteing) for a few minutes destroys the stinging hairs. Cooked nettles taste similar to spinach.

Can nettle root help my prostate?⌄

Multiple trials suggest modest improvement in BPH symptoms with nettle root, particularly when combined with saw palmetto. Effects are smaller than prescription alpha-blockers.

Will I get stung if I drink nettle tea?⌄

No. Drying and steeping in hot water destroys the stinging compounds. Nettle tea is safe and is a traditional preparation.

Is nettle high in iron?⌄

Nettle leaves contain modest amounts of iron compared to plant foods, plus other minerals like calcium and magnesium. They are nutrient-dense but not an iron supplement substitute for diagnosed iron deficiency.

References

Wikidata: Urtica dioica — Wikidata link

Track Stinging Nettle with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.