Nettle leaf: what the evidence supports and how to choose tea or capsules
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- Organic nettle leaf tea. Best for: People who want nettle as a caffeine-free herbal tea. See options on Amazon
- Organic cut and sifted nettle leaf. Best for: Tea drinkers who like loose herbs. See options on Amazon
- Nettle leaf extract capsules. Best for: Adults who prefer a capsule. See options on Amazon
What nettle leaf is
Stinging nettle (Urtica dioica) is a perennial flowering plant native to Asia, Europe and North America. MSK notes that several compounds, including flavonoid glycosides, appear to contribute to its effects, although how it works is unclear.
Leaf and root are used differently. MSK says the root is widely used for an enlarged prostate (BPH), allergies, arthritis and inflammation, and is usually combined with saw palmetto or pygeum for BPH. Leaf products are commonly sold as tea and for seasonal or sinus support, such as Gaia Herbs Nettle Leaf, which it describes as traditionally used for sinus support.
What the research shows
| Use | What MSK reports |
|---|---|
| Seasonal allergies | Evidence lacking; lab studies only |
| Arthritis | Small trials support topical use; larger studies needed |
| Blood sugar in type 2 diabetes | One trial of a leaf extract; more study needed |
| Prostate symptoms (BPH) | Positive results, mainly root combined with other herbs |
| Chest congestion, muscle spasms | Evidence lacking |
Allergies. In lab studies, nettle extract blocked several steps in the allergy response, including histamine-1 receptor activity and prostaglandin formation. MSK says evidence is lacking that this helps people with allergies.
Arthritis. Limited clinical data suggest nettle may help osteoarthritis of the hip, knee and hand. Some of that research used nettle applied to the skin, and larger studies are needed.
Blood sugar. A randomized trial in people with advanced type 2 diabetes found improved blood sugar control with a nettle leaf extract. MSK says more study is needed. Do not use nettle in place of diabetes medicine.
Side effects and cautions
- Low blood sugar. MSK reports a 78-year-old man who developed low blood sugar after taking an herbal remedy containing nettle.
- Hormone-like effects. Case reports describe enlarged breasts in a man and nipple discharge in a woman after drinking nettle tea.
- Breastfed infants. One infant developed hives after the mother used water boiled with stinging nettle on cracked nipples.
- Allergy. Nettle pollen caused allergic rhinitis in two people.
- Pregnancy and breastfeeding. Gaia Herbs labels its nettle leaf not for use during pregnancy or lactation.
Drug interactions
MSK lists these possible interactions, mostly from animal studies, with clinical relevance not yet known:
- Water pills (diuretics). Nettle may add to their effect.
- Blood pressure drugs. Nettle lowered blood pressure in animals and may add to these drugs.
- Drugs processed by CYP450 liver enzymes. Nettle may change their levels.
- Diabetes medicines. Because nettle may lower blood sugar, check with your provider and monitor closely.
If you take any prescription medicine, talk with your provider or pharmacist before using nettle supplements.
Tea, loose leaf or capsules?
- Tea bags and loose leaf. Dried nettle leaf is widely sold for brewing. Note that hormone-like case reports involved nettle tea, so tea is not automatically risk free.
- Capsules. Gaia Herbs Nettle Leaf gives 225 mg of organic nettle leaf extract per capsule, with directions for adults to take 1 capsule 2 times daily between meals.
- Ratio extracts. Concentrated leaf extracts are also sold; follow the label and do not exceed it.
- Leaf and root tinctures. Some liquids combine leaf and root. If you want leaf only, check the label.
- Prostate formulas. These usually use nettle root with saw palmetto, which is a different product from nettle leaf.
How to choose nettle leaf
- Plant part. Confirm the label says leaf (folium) if that is what you want, not root.
- Latin name. Look for Urtica dioica.
- Organic and tested. Prefer brands that state organic certification or third-party testing.
- Realistic claims. Products promising allergy relief go beyond what MSK says the evidence shows.
- Medicine check. Ask first if you take water pills, blood pressure or diabetes medicine.
What to look for when you buy
Organic nettle leaf tea
Best for: People who want nettle as a caffeine-free herbal tea
Dried organic nettle leaf tea bags are widely sold and easy to brew.
Watch out: Hormone-like effects have been reported with nettle tea. Not for pregnancy or breastfeeding without your provider's okay.
See options on AmazonOrganic cut and sifted nettle leaf
Best for: Tea drinkers who like loose herbs
Loose dried leaf lets you control strength when brewing.
Watch out: Same medicine cautions as other nettle products. Keep sealed and dry.
See options on AmazonNettle leaf extract capsules
Best for: Adults who prefer a capsule
Gaia Herbs lists 225 mg of organic nettle leaf extract per capsule, taken twice daily between meals.
Watch out: Evidence for allergy relief is lacking. Ask first if you take water pills, blood pressure or diabetes medicine.
See options on AmazonQuestions people ask
- What is nettle leaf good for?
- It is used for allergies, joints and general wellness. MSK says evidence is lacking for allergies, with limited evidence for arthritis and blood sugar.
- Does nettle leaf help allergies?
- Lab studies show nettle blocks some allergy pathways, but MSK says evidence is lacking in people.
- What is the difference between nettle leaf and nettle root?
- The root is the part mainly used and studied for prostate symptoms, usually with saw palmetto. The leaf is more often sold as tea and for seasonal support.
- Is nettle leaf tea safe?
- Rare case reports linked nettle tea to hormone-like effects. Avoid it in pregnancy and breastfeeding without your provider's approval and check medicines first.
- Does nettle lower blood pressure or blood sugar?
- Animal studies suggest it may lower blood pressure, and one trial found better blood sugar control in type 2 diabetes. Ask your provider if you take medicine for either.
- How should I take nettle leaf capsules?
- Follow the label. Gaia Herbs directs 1 capsule 2 times daily between meals for adults.
Sources
- Nettle: About Herbs (mskcc.org), Memorial Sloan Kettering Cancer Center
- Nettle Leaf (gaiaherbs.com), Gaia Herbs