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Limited evidenceGeneral health

Juniper Berry

A traditional diuretic and urinary herb. The only decent modern trial tested it for indigestion, not for the urinary tract, and the traditional diuretic use rests on essential oil pharmacology rather than clinical data.

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What the science says

  • Functional dyspepsia Limited evidence

    A randomised, double-blind, placebo-controlled trial of a standardised 100 mg juniper preparation reported improvement in functional dyspepsia symptoms. This is the single good-quality human trial of juniper and it concerns digestion, not the urinary tract.

  • Diuretic and urinary use Limited evidence

    Reviews of botanical medicines for the urinary tract describe juniper as a traditional aquaretic whose terpinen-4-ol content increases renal filtration in animal models. No controlled human trial has measured urine output or urinary infection outcomes with juniper.

Dosage & safety

Studied doseThe dyspepsia trial used a standardised 100 mg preparation. Traditional herbal use is 2–10 g/day of dried berries as a tea, generally recommended for no more than four to six weeks at a time.
SafetyJuniper essential oil in high doses has historically been associated with kidney irritation, though this is often attributed to adulterated or turpentine-contaminated oils rather than the berry itself. It is a traditional emmenagogue and should be avoided in pregnancy. Avoid with existing kidney disease and do not use long-term.

How to take it

TimingTraditionally taken before or with meals for digestive use; limit any course to four to six weeks.
With food?Take with food, since the berries are aromatic and can irritate an empty stomach.
Worth knowingUse the berry preparation, not the essential oil — the historical kidney-irritation reports centre on concentrated and often adulterated oils.

Interactions

With medications

  • diuretics (furosemide, hydrochlorothiazide)

    Additive fluid and electrolyte loss, particularly potassium. do not combine without medical supervision

  • lithium

    A diuretic effect reduces lithium clearance and can raise blood levels into the toxic range. do not combine without lithium level monitoring

With other supplements

  • other diuretic herbs (goldenrod, parsley, corn silk, buchu)

    Additive fluid and electrolyte loss with no added benefit. use one at a time

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does juniper berry work as a diuretic?

Unproven in people: juniper berry's diuretic reputation rests on essential-oil pharmacology and animal models, and no controlled human trial has measured urine output or urinary infection outcomes. The evidence grade is limited.

Does juniper berry help indigestion?

Possibly — the one good-quality human trial of juniper berry found a standardised 100 mg preparation improved functional dyspepsia symptoms versus placebo. It is a single trial, so the evidence remains limited.

Is juniper berry safe for your kidneys?

Avoid juniper berry if you have kidney disease and do not use it long term; limit any course to four to six weeks. The historical kidney-irritation reports centre on concentrated, often adulterated essential oils, so use the berry preparation, not the oil.

Can you take juniper berry with lithium or diuretics?

Not without supervision: juniper berry's diuretic effect can reduce lithium clearance and push blood levels into the toxic range, and it adds to fluid and potassium loss with furosemide or hydrochlorothiazide. It should also be avoided in pregnancy.

Scientific references

Related in General health

Herbal medicines: what the evidence says (335)