Couch Grass

BotanicalBest taken away from food

What is it

Couch grass (Elymus repens, formerly Agropyron repens) is a perennial grass whose rhizomes have a long European folk-medicine history as a mild diuretic and demulcent for the urinary tract.

Evidence for 1 use

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

Mild urinary tract irritation

Limited Evidence

European traditional medicine uses couch grass for mild irritation of the urinary tract and increased urine flow. Modern clinical evidence is limited.

How it works

The rhizome contains triticin (an inulin-type fructan), mucilage, saponins, and small amounts of essential oil. Traditional use is for soothing the urinary tract and promoting urine flow. Mechanistic and clinical evidence in humans is largely traditional rather than from modern controlled trials.

Dosage

Traditional doses are 4-8 g of dried rhizome as decoction, or 4-8 mL of liquid extract, two to three times daily. No formal RDA exists.

When and how to take it

Often taken between meals with a glass of water. Avoid taking close to bedtime if it increases nighttime urination.

2 commercial forms

Compare the main delivery options and what they’re best suited for.

Dried rhizome / decoction

Traditional preparation.

Water-soluble mucilage and fructans extract well.

Liquid extract

Common modern form.

Hydroalcoholic extracts concentrate constituents.

Safety

Generally well tolerated. Increased urine output can transiently affect fluid and electrolyte balance.

Who should be cautious

Avoid in advanced kidney or heart failure where fluid balance must be tightly controlled without medical supervision. Limited pregnancy data; avoid concentrated extracts.

Interactions

Theoretical additive effect with diuretic drugs, lithium, or other medications affected by fluid status, though clinical reports are limited.

Food sources

Couch grass tea (rhizome)

Amount
1-2 g per cup
%DV
—

Frequently asked questions

Is couch grass the same as wheat grass?⌄

No, despite some label overlap. Couch grass is Elymus (or Agropyron) repens. Wheat grass is young Triticum aestivum. Many products labeled 'wheat grass' are not couch grass.

Does couch grass cure UTIs?⌄

No. It is used traditionally for mild urinary tract irritation and increased urine flow, not as a treatment for diagnosed infections, which need appropriate medical care.

References

Couch Grass on Wikidata — Wikidata link

Couch Grass on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Couch Grass (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

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.