Cranberry juice isn’t just refreshing — it’s also packed with unique plant compounds that make it a smart addition to your daily routine.

What’s in Pure, 100% Cranberry Juice?
One cup (about 240mL) of 100% pure, unsweetened cranberry juice has only about 72 calories, mostly from natural fruit sugars, plus small amounts of vitamins and minerals like potassium, vitamin K, and magnesium [1].

1 cup (about 240mL) weighs approximately 248g
Source: USDA Nutrient Database [1] + 100% pure cranberry juice package

But what makes cranberry juice truly special isn’t the vitamins — it’s the polyphenols.

The Power of Polyphenols
Cranberry juice is rich in polyphenols – natural plant antioxidants that may help protect your body’s cells.

A cup of 100% cranberry juice delivers around 135 mg of polyphenols. These include:

• Proanthocyanidins (PACs): The stars of the show, that have been linked to urinary tract health and other benefits.
• Anthocyanins: Natural pigments that give cranberries their bold red color.
• Phenolic acids: Compounds with anti-inflammatory effects.
• Flavanols & flavonols: Known for supporting heart and blood vessel health [2].

On average, one cup of 100% cranberry juice provides: 8.4mg of flavan-3-ols, 21.4 – 55.2mg of proanthocyanidins, 6.5mg – 31.7mg of anthocyanins, 2.6mg – 13.9mg of flavonols, 15.4mg hydroxybenzoic acid (phenolic acid) and 2.9 – 4.6mg hydroxy cinnamic acid (phenolic acid) [3]. Together, these compounds may act like a defense system for your body — protecting cells, calming inflammation, and supporting long-term wellness.

There are commercial juice products widely available that contain 25-27% cranberry juice, water and a sweetener and they are beneficial too. Some of these cranberry juice drinks have clinical data that show positive results for maintenance of UTI at a 1 cup serving size/day. The equivalent serving of 100% pure cranberry juice would be about ¼ – ⅓ cup per day.

Cranberry Juice & UTI
Cranberries are best known for their role in urinary tract health. In one study, with over 300 women with a history of frequent UTIs (≥2 UTIs in the past year of which ≥1 UTI had been treated ≤6 months of the screening visit) – a daily cup of 27% cranberry juice drink resulted in significantly fewer infections compared to those who didn’t drink cranberry juice [2]. Several large clinical trials have also found that one cup of 27% cranberry juice drink daily helped reduce UTI recurrence in women who frequently got them [3].
Here’s why:

• PACs in cranberry juice make it harder for bacteria like E. coli to stick to the urinary tract walls.
• With nothing to cling to, bacteria are simply flushed out in the urine [5-8].
• Cranberry compounds may also help reduce inflammation, which lowers the risk of repeat infections [9-12].

Cranberry juice won’t cure an active UTI — antibiotics are still needed if you have an infection. But drinking cranberry juice regularly may help reduce repeat infections thereby reducing antibiotic use over time. If you’re on blood thinners (like warfarin), check with your doctor before drinking large amounts of cranberry juice daily as it may interact with your medication, however, normal serving sizes have been shown to not interact with blood thinners.

Research-backed dose: Aim for at least 36 mg PACs per serving per day (about 1/3-1/2 cup (80mL- 120mL) of 100% pure cranberry juice or 1 cup (about 240mL) of 27% cranberry juice drink).

Other Benefits Beyond UTI
Beyond UTI prevention, cranberry juice may also support your overall health:

• Heart health: Studies show that drinking 1–2 cups of cranberry juice drink daily may strengthen your body’s antioxidant defenses and reduce oxidation of LDL (“bad”) cholesterol — a key factor in heart disease [13]. Research also links cranberry juice to better blood sugar control [13, 15], lower inflammation [13, 15], improved HDL (“good”) cholesterol [14], reduced triglycerides [15], and healthier blood pressure [15], vascular function and circulation [16].
• Antioxidant protection: Cranberry juice may also help reduce oxidative stress (damage caused by free radicals), which is linked to aging and long-term health problems [13, 14].
• Metabolism: Regular intake of cranberry juice may support healthier blood sugar regulation and overall metabolic balance [13, 14].

How Much Should You Drink?

• Most studies used 1 cup of 27% cranberry juice drink daily. One cup a day can deliver a meaningful boost of antioxidants and polyphenols for overall wellness [13-16].

The Bottom Line
Cranberry juice is more than a tart, tasty refreshing drink — it’s a natural source of protective compounds that give your body an extra layer of protection. A daily serving of cranberry juice can support urinary tract health, deliver antioxidants to protect your cells, and contribute to heart, metabolic, and overall wellness.

References

1. United States Department of Agriculture. Food Data Central. Cranberry Juice blend, 100% juice. Available online: FDC ID:2709324 Food Code:64105400 https://fdc.nal.usda.gov/food-details/2709317/nutrients (accessed 17 September, 2025).
2. Maki KC, Kaspar KL, Khoo C, Derrig LH, Schild AL, Gupta K. 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 Jun;103(6):1434-42. doi: 10.3945/ajcn.116.130542. Erratum in: Am J Clin Nutr. 2017 Aug;106(2):708. doi: 10.3945/ajcn.117.161851. PMID: 27251185.
3. Williams G, Hahn D, Stephens JH, Craig JC, Hodson EM. Cranberries for preventing urinary tract infections. Cochrane Database Syst Rev. 2023 Apr 17;4(4):CD001321. doi: 10.1002/14651858.CD001321.pub6. Update in: Cochrane Database Syst Rev. 2023 Nov 10;11:CD001321. doi: 10.1002/14651858.CD001321.pub7. PMID: 37068952; PMCID: PMC10108827.
4. Blumberg, J.B.; Camesano, T.A.; Cassidy, A.; Kris-Etherton, P.; Howell, A.; Manach, C.; Ostertag, L.M.; Sies, H.; Skulas-Ray, A.; Vita, J.A. Cranberries and their bioactive constituents in human health. Adv. Nutr. 2013, 4, 618–632. [CrossRef]
5. Lavigne JP, Bourg G, Combescure C, Botto H, Sotto A. In-vitro and invivo evidence of dose-dependent decrease of uropathogenic Escherichia coli virulence after consumption of commercial Vaccinium macrocarpon (cranberry) capsules. Clin Microbiol Infect 2008;14:350–5.
6. Harmidy K, Tufenkji N, Gruenheid S. Perturbation of host cell cytoskeleton by cranberry proanthocyanidins and their effect on enteric infections. PLoS One 2011;6:e27267.
7. Feliciano RP, Meudt JJ, Shanmuganayagam D, Krueger CG, Reed JD. Ratio of “A-type” to “B-type” proanthocyanidin interflavan bonds affects extra-intestinal pathogenic Escherichia coli invasion of gut epithelial cells. J Agric Food Chem 2014;62:3919–25.
8. Krueger CG, Reed JD, Feliciano RP, Howell AB. Quantifying and characterizing proanthocyanidins in cranberries in relation to urinary tract health. Anal Bioanal Chem 2013;405:4385–95.
9. Huang Y, Nikolic D, Pendland S, Doyle BJ, Locklear TD, Mahady GB. Effects of cranberry extracts and ursolic derivatives on P-fimbriated Escherichia coli, COX-2 activity, pro-inflammatory cytokine release and the NF-kappa-beta transcriptional response in vitro. Pharm Biol 2009;47:18–25.
10. Vasileiou I, Katsargyris A, Theocharis S, Giagninis C. Current clinical status on the preventive effects of cranberry consumption against urinary tract infections. Nutr Res 2013;33:595–607.
11. Denis MC, Desjardins Y, Furtos A, Marcil V, Dudonne S, Montoudis A, Garofalo C, Delvin E, Marette A, Levy E. Prevention of oxidative stress, inflammation and mitochondrial dysfunction in the intestine by different cranberry phenolic fractions. Clin Sci (Lond) 2015;128:197– 212.
12. Robino L, Algorta G, Zunino P, Vignoli R. Detection of intracellular bacterial communities in a child with Escherichia coli recurrent urinary tract infections. Pathog Dis 2013;68:78–81.
13. Basu A, Betts NM, Ortiz J, Simmons B, Wu M, Lyons TJ. Low-energy cranberry juice decreases lipid oxidation and increases plasma antioxidant capacity in women with metabolic syndrome. Nutr Res. 2011 Mar;31(3):190-6. doi: 10.1016/j.nutres.2011.02.003. PMID: 21481712; PMCID: PMC3075541.
14. Chew B, Mathison B, Kimble L, McKay D, Kaspar K, Khoo C, Chen CO, Blumberg J. Chronic consumption of a low calorie, high polyphenol cranberry beverage attenuates inflammation and improves glucoregulation and HDL cholesterol in healthy overweight humans: a randomized controlled trial. Eur J Nutr. 2019 Apr;58(3):1223-1235. doi: 10.1007/s00394-018-1643-z. Epub 2018 Feb 23. PMID: 29476238; PMCID: PMC6499871.
15. Novotny JA, Baer DJ, Khoo C, Gebauer SK, Charron CS. Cranberry juice consumption lowers markers of cardiometabolic risk, including blood pressure and circulating C-reactive protein, triglyceride, and glucose concentrations in adults. J Nutr. 2015 Jun;145(6):1185-93. doi: 10.3945/jn.114.203190. Epub 2015 Apr 22. PMID: 25904733.
16. Rodriguez-Mateos A, Feliciano RP, Boeres A, Weber T, Dos Santos CN, Ventura MR, Heiss C. Cranberry (poly)phenol metabolites correlate with improvements in vascular function: A double-blind, randomized, controlled, dose-response, crossover study. Mol Nutr Food Res. 2016 Oct;60(10):2130-2140. doi: 10.1002/mnfr.201600250. Epub 2016 Jun 16. PMID: 27242317.