Supplement Forms/Alternate Names:

  • American cranberry, bearberry


Cranberry is a small red berry that is high in Vitamin C. This vitamin helps the body fight illness. Cranberry has been used to prevent bacterial infections. It can be taken as a juice, extract, cooked, or eaten raw. It can also be taken as a pill or powder.


500 milligrams 1 to 2 times daily or one glass 1 to 2 times daily

What Research Shows

Likely Effective

May Be Effective

  • Helicobacter pylori infection—may reduce time of infection when used with standard treatmentA1, A2

Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.

Editorial process and description of evidence categories can be found at EBSCO NAT Editorial Process.

Safety Notes

It is likely safe for most people to take cranberry.


Talk to your doctor about any supplements or therapy you would like to use. Some can interfere with treatment or make conditions worse, such as:

  • People with proton pump inhibitors should talk to their doctors before taking cranberry. It may reduce effectiveness.
  • People with stomach ulcers or acid reflex should talk to their doctor before taking cranberry. It may interact with their medicines.
  • People taking blood thinners or medicine to break up blood clots should talk to their doctors before taking large amounts of cranberry. It may increase the risk of bleeding. B1-B3


REFA Helicobacter Pylori

REFA1 Seyyedmajidi M, Ahmad A, et al. Addition of cranberry to proton pump inhibitor-based triple therapy for Helicobacter pylori eradication. J Res Pharm Pract. 2016;5(4):248-251.

REFA2 Yang-Ou YB, Hu Y, et al. The effect of antioxidants on Helicobacter pylori eradication: A systematic review with meta-analysis. Helicobacter. 2018 Dec;23(6):e12535. Dec;23(6):e12535.

REFB Safety

REFB1 Haber SL, Cauthon KA, et al. Cranberry and warfarin interaction: a case report and review of the literature. Consult Pharm. 2012 Jan;27(1):58-65.

REFB2 Srinivas NR. Cranberry juice ingestion and clinical drug-drug interaction potentials; review of case studies and perspectives. J Pharm Pharm Sci. 2013;16(2):289-303.

REFB3 Norwood DA, Parke CK, et al. A Comprehensive Review of Potential Warfarin-Fruit Interactions. J Pharm Pract. 2015 Dec;28(6):561-571.

REFC Urinary Tract Infection

REFC1 Vidlar A, Vostalova J, et al. The effectiveness of dried cranberries (Vaccinium macrocarpon) in men with lower urinary tract symptoms. Br J Nutr. 2010 Oct;104(8):1181-1189.

REFC2 Barbosa-Cesnik C, Brown MB, et al. Cranberry juice fails to prevent recurrent urinary tract infection: results from a randomized placebo-controlled trial. Clin Infect Dis. 2011 Jan 1;52(1):23-30.

REFC3 Afshar K, Stothers L, et al. Cranberry juice for the prevention of pediatric urinary tract infection: a randomized controlled trial. J Urol. 2012 Oct;188(4 Suppl):1584-1587.

REFC4 Salo J, Uhari M, et al. Cranberry juice for the prevention of recurrences of urinary tract infections in children: a randomized placebo-controlled trial. Clin Infect Dis. 2012 Feb 1;54(3):340-346.

REFC5 Stapleton AE, Dziura J, et al. Recurrent urinary tract infection and urinary Escherichia coli in women ingesting cranberry juice daily: a randomized controlled trial. Mayo Clin Proc. 2012 Feb;87(2):143-50.

REFC6 Wang CH, Fang CC, et al. Cranberry-containing products for prevention of urinary tract infections in susceptible populations: a systematic review and meta-analysis of randomized controlled trials. Arch Intern Med. 2012;172(13):988-996.

REFC7 Takahashi S, Hamasuna R, et al. A randomized clinical trial to evaluate the preventive effect of cranberry juice (UR65) for patients with recurrent urinary tract infection. J Infect Chemother. 2013 Feb;19(1):112-117.

REFC8 Caljouw MA, van den Hout WB, et al. Effectiveness of cranberry capsules to prevent urinary tract infections in vulnerable older persons: a double-blind randomized placebo-controlled trial in long-term care facilities. J Am Geriatr Soc. 2014 Jan;62(1):103-110.

REFC9 Barnoiu OS, Sequeira-García Del Moral J, et al. American cranberry (proanthocyanidin 120 mg): its value for the prevention of urinary tracts infections after ureteral catheter placement. Actas Urol Esp. 2015;39(2):112-117.

REFC10 Foxman B, Cronenwett AE, et al. Cranberry juice capsules and urinary tract infection after surgery: results of a randomized trial. Am J Obstet Gynecol. 2015;213(2):194.

REFC11 Vostalova J, Vidlar A, et al. Are High Proanthocyanidins Key to Cranberry Efficacy in the Prevention of Recurrent Urinary Tract Infection? Phytother Res. 2015;29(10):1559-1567.

REFC12 Juthani-Mehta M, Van Ness PH, et al. Effect of Cranberry Capsules on Bacteriuria Plus Pyuria Among Older Women in Nursing Homes: A Randomized Clinical Trial. JAMA. 2016 Nov 8;316(18):1879-1887.

REFC13 Maki KC, Kaspar KL, et al. Consumption of a cranberry juice beverage lowered the number of clinical urinary tract infection episodes in women with a recent history of urinary tract infection. Am J Clin Nutr. 2016;103(6):1434-1442.

REFC14 Occhipinti A, Germano A, et al. Prevention of Urinary Tract Infection with Oximacro, A Cranberry Extract with a High Content of A-Type Proanthocyanidins: A Pre-Clinical Double-Blind Controlled Study. Urol J. 2016;13(2):2640-2649.

REFC15 Singh I, Gautam LK, et al. Effect of oral cranberry extract (standardized proanthocyanidin-A) in patients with recurrent UTI by pathogenic E. coli: a randomized placebo-controlled clinical research study. Int Urol Nephrol. 2016;48(9):1379-1386.

REFC16 Vidlar A, Student V Jr, et al. Cranberry fruit powder (Flowens™) improves lower urinary tract symptoms in men: a double-blind, randomized, placebo-controlled study. World J Urol. 2016;34(3):419-424.

REFC17 Wan KS, Liu CK, et al. Cranberries for Preventing Recurrent Urinary Tract Infections in Uncircumcised Boys. Altern Ther Health Med. 2016 Nov;22(6):20-23.

REFC18 Fu Z, Liska D, et al. Cranberry Reduces the Risk of Urinary Tract Infection Recurrence in Otherwise Healthy Women: A Systematic Review and Meta-Analysis. J Nutr. 2017;47(12):2282-2288.

REFC19 Gunnarsson AK, Gunningberg L, et al. Cranberry juice concentrate does not significantly decrease the incidence of acquired bacteriuria in female hip fracture patients receiving urine catheter: a double-blind randomized trial. Clin Interv Aging. 2017 Jan 13;12:137-143.

REFC20 Ledda A, Belcaro G, et al. Highly standardized cranberry extract supplementation (Anthocran®) as prophylaxis in young healthy subjects with recurrent urinary tract infections. Eur Rev Med Pharmacol Sci. 2017 Jan;21(2):389-393.

REFC21 Temiz Z, Cavdar I, et al. The effects of training and the use of cranberry capsule in preventing urinary tract infections after urostomy. Complement Ther Clin Pract. 2018;31:111-117.

Revision Information

  • Reviewer: EBSCO NAT Review Board Eric Hurwitz, DC
  • Review Date: 02/2020
  • Update Date: 06/22/2020