A research review of human and relevant scientific studies on Urtica dioica.
Last reviewed: August 2026
🔬 Research Summary
- Glucose metabolism: Systematic reviews/meta-analyses of clinical trials report reductions in fasting glucose and, in some analyses, HbA1c. Much of the evidence involves people with type 2 diabetes and concentrated preparations.
- Blood pressure: Human studies have investigated nettle preparations for blood pressure, including a randomized trial reporting reductions in several blood-pressure measures.
- Lipids & metabolic markers: Clinical trials have examined cholesterol and other metabolic markers with mixed results.
- Joint & inflammatory outcomes: Nettle has been studied in arthritis and inflammatory contexts, but evidence is less consistent and some research uses topical or combination preparations.
- Urinary/prostate outcomes: Nettle root, rather than leaf tea, has been studied extensively in benign prostatic hyperplasia. This evidence should not automatically be applied to nettle leaf tea.
- Minerals & nutritional composition: Nettle leaves can contain substantial calcium, potassium, magnesium and other minerals. Actual transfer into an infusion depends on plant material, growing conditions and brewing.
The sections below summarize the principal health areas investigated in the literature. Evidence strength is not uniform, and studies using extracts, oils, capsules or combination products are identified conceptually rather than treated as interchangeable with tea.
Glucose metabolism
What researchers found
Systematic reviews/meta-analyses of clinical trials report reductions in fasting glucose and, in some analyses, HbA1c. Much of the evidence involves people with type 2 diabetes and concentrated preparations.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Blood pressure
What researchers found
Human studies have investigated nettle preparations for blood pressure, including a randomized trial reporting reductions in several blood-pressure measures.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Lipids & metabolic markers
What researchers found
Clinical trials have examined cholesterol and other metabolic markers with mixed results.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Joint & inflammatory outcomes
What researchers found
Nettle has been studied in arthritis and inflammatory contexts, but evidence is less consistent and some research uses topical or combination preparations.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Urinary/prostate outcomes
What researchers found
Nettle root, rather than leaf tea, has been studied extensively in benign prostatic hyperplasia. This evidence should not automatically be applied to nettle leaf tea.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Minerals & nutritional composition
What researchers found
Nettle leaves can contain substantial calcium, potassium, magnesium and other minerals. Actual transfer into an infusion depends on plant material, growing conditions and brewing.
What remains uncertain
Study results, doses, preparations and participant populations differ. Where the evidence is based mainly on extracts, oils, capsules, combinations, laboratory models or people with a specific condition, that limitation should be considered when interpreting the findings for a normal cup of tea.
Overall Assessment
Nettle has interesting human cardiometabolic research and a distinctive nutritional/mineral profile. The major limitation for tea interpretation is that many clinical studies use extracts or other preparations, while urinary/prostate evidence mainly concerns the root.
References
- Ziaei R, Foshati S, Hadi A, et al. The effect of nettle (Urtica dioica) supplementation on the glycemic control of patients with type 2 diabetes mellitus: a systematic review and meta-analysis. Phytother Res. 2020;34(2):282-294. PMID: 31802554. doi:10.1002/ptr.6535.
- Tabrizi R, et al. Effects of Urtica dioica on Metabolic Profiles in Type 2 Diabetes: A Systematic Review and Meta-analysis of Clinical Trials. Mini Rev Med Chem. 2022;22(3):550-563. PMID: 34587883. doi:10.2174/1389557521666210929143112.
- Effect of Urtica dioica on blood pressure in adults with mild hypertension: randomized clinical research. 2019. Human trial evidence is limited and preparation-specific.
Reference note: References were selected to represent the principal human clinical and systematic-review evidence discussed in this article. Where direct tea-infusion evidence is limited, the article explicitly identifies that limitation.
Publication version: August 2026
Our Pure Nettle is whole leaf and nothing else.
These statements have not been evaluated by Medsafe. This tea is not intended to diagnose, treat, cure, or prevent any disease. If you are pregnant, breastfeeding, or managing a health condition, check with your healthcare provider before making it a regular habit.
