What Does Research Say About Nettle Tea? Benefits, Evidence, and What's Not Established

Nettle Leaf vs. Nettle Root: Why the Distinction Matters

Before looking at what research says about nettle, it's essential to clarify which part of the plant is being discussed. Nettle leaf and nettle root are different preparations with different phytochemical profiles and different traditional use histories. The most compelling clinical research on nettle — particularly studies on BPH (benign prostatic hyperplasia) — uses root extract, not leaf tea. Farmer Soul sells the leaf, not the root. These are not interchangeable, and findings from root extract research should not be extrapolated to leaf tea.

What Has Been Studied

Research on stinging nettle leaf has examined several areas:

• Anti-inflammatory activity in laboratory and clinical settings
• Effects on allergic rhinitis (seasonal allergies)
• Nutritional composition — nettle leaf is notably dense in vitamins, minerals, and plant compounds
• Effects on blood glucose in some populations

Research on stinging nettle root has focused primarily on BPH and prostate-related outcomes, with a number of clinical trials showing moderate effects. This root research is separate from what applies to leaf tea.

Nettle Leaf and Anti-Inflammatory Research

Several laboratory studies have found that stinging nettle leaf extracts demonstrate anti-inflammatory activity in vitro, including inhibition of inflammatory markers like TNF-α and interleukin-1β. A frequently referenced 2013 study published in Phytomedicine examined nettle extract in an inflammatory model and found significant reduction in inflammatory markers.

In vitro anti-inflammatory findings are common across many botanical extracts and do not automatically translate to clinical efficacy in humans. Clinical trials on nettle leaf for anti-inflammatory outcomes in humans are limited.

Nettle and Allergic Rhinitis

A 1990 double-blind randomized trial published in Planta Medica by Mittman examined freeze-dried stinging nettle leaf for allergic rhinitis symptoms. The study found that 58 percent of participants rated nettle as effective compared to 37 percent in the placebo group, with modest but statistically notable results. The preparation used was freeze-dried leaf, not brewed tea, and the study is frequently cited but has not been replicated at scale in subsequent trials.

Nutritional Profile

Nettle leaf is nutritionally dense, particularly when compared to other commonly consumed leafy herbs. It contains meaningful amounts of iron, calcium, magnesium, potassium, vitamins A, C, and K, and several flavonoids. As a tea brewed from dried leaf, the bioavailability of these nutrients is reduced compared to consuming fresh or cooked nettle as a vegetable — but nettle tea does contribute some nutritional content beyond being a simple flavored water.

What Remains Limited or Uncertain

Most human clinical trials on nettle leaf have been small, and findings across different preparations (freeze-dried, extracted, tea, cooked leaf) are not directly comparable. The research base is considerably smaller and less consistent than what exists for some other well-studied botanical teas. Nettle leaf tea should be understood as a traditional beverage with a nutritional profile and a modest, preliminary research base, not as a clinically validated treatment.

Related Reading

• Nettle Safety: Who Should Avoid It and Possible Interactions
• Nettle Tea vs. Green Tea: How They Compare
• How to Harvest and Prepare Fresh Stinging Nettle Safely
• Nettle Tea vs. Dandelion Root Tea

Sources

Mittman, P. (1990). Randomized, Double-Blind Study of Freeze-Dried Urtica dioica in the Treatment of Allergic Rhinitis. Planta Medica.
https://pubmed.ncbi.nlm.nih.gov/2192379/

Roschek, B., et al. (2009). Nettle extract (Urtica dioica) affects key receptors and enzymes associated with allergic rhinitis. Phytotherapy Research.
https://pubmed.ncbi.nlm.nih.gov/19140159/

USDA PLANTS Database: Urtica dioica. https://plants.usda.gov/home/plantProfile?symbol=URDI

National Center for Complementary and Integrative Health: Stinging Nettle. https://www.nccih.nih.gov/health/stinging-nettle

This article is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before use, especially if you are pregnant, nursing, taking medications, or managing a health condition.