Herbs

Cranberry

Also called: cranberry extract

Cranberry juice or capsules.

Why people take it
Preventing urinary tract infections.
What the evidence says
Some evidence for fewer repeat UTIs in women; does not treat an infection.
How it is usually taken
Juice or capsules of 300 to 500 mg proanthocyanidin-standardised extract a day.
Be careful
May add to warfarin; kidney stone risk in high doses.
Medicines it can interact with
Large amounts may add to the effect of warfarin.

Other herbs

EchinaceaElderberryGarlic extractGingerPeppermint oilMilk thistleSaw palmettoSt John's wortValerianChamomileLemon balmPassionflowerKavaRhodiolaGinkgoMoringaFenugreekCinnamonBlack seedLicorice

Common questions

What is Cranberry?

Cranberry juice or capsules.

Why do people take Cranberry?

Preventing urinary tract infections.

Does Cranberry work?

Some evidence for fewer repeat UTIs in women; does not treat an infection.

How much Cranberry do people take?

Juice or capsules of 300 to 500 mg proanthocyanidin-standardised extract a day.

Is Cranberry safe?

May add to warfarin; kidney stone risk in high doses.

Does Cranberry interact with medicines?

Large amounts may add to the effect of warfarin.

Sources and further reading

Last reviewed 31 October 2026. Written by Satya Babu.

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For information only, not medical advice. Supplements are not medicines: they are not tested and approved like drugs before they are sold, and they can interact with medicines. Talk to your doctor or pharmacist before you start one, especially if you are pregnant or breastfeeding, take regular medicines, or have kidney, liver or heart disease.