Urinary tract infections (UTIs) are among the most common outpatient infections in the United States, with a substantial global disease burden and a significantly higher age-standardized incidence rate in women than in men. As recurrent UTIs often require prolonged or repeated antibiotic treatment, concerns about antimicrobial resistance and the adverse effects of long-term antibiotic use have increased interest in complementary approaches. Cranberry, a North American berry rich in proanthocyanidins (PACs), flavonoids, and phenolic acids, has attracted considerable attention for its potential role in UTI prevention. Research suggests that cranberry-derived bioactive compounds may help reduce bacterial adhesion to urinary tract epithelial cells, while gut microbial metabolism may contribute to their biological activity. Beyond urinary tract health, studies have also explored the potential of cranberry compounds in areas such as vulvovaginal candidiasis, vaginal health, and healthy aging. Meanwhile, growing consumer awareness of cranberry's nutritional properties is supporting the development of cranberry-based dietary supplements. This article reviews the bioactive compounds in cranberries, their potential health benefits, and the market development of cranberry products, based on the studies cited below.
Urinary tract infections (UTIs) are among the most common outpatient infections in the United States, accounting for approximately 10.5 million physician visits annually, with the rate of UTI-related visits increasing year by year. In 2019, there were approximately 400 million UTI cases worldwide, resulting in 236,800 deaths. The age-standardized incidence rate among women was 3.6 times that among men, making women a key population for UTI prevention and control.
Most UTIs are caused by bacteria and require prolonged or repeated courses of antibiotic treatment. This can exacerbate antimicrobial resistance and contribute to other adverse outcomes associated with long-term antibiotic use. Consequently, increasing attention has been directed toward cranberry, a natural plant-derived ingredient, for its potential role in supporting urinary tract health and helping prevent recurrent UTIs.
1. Cranberry: A Natural Ingredient for UTI Prevention
In February 2025, an article published in Frontiers in Nutrition presented a comprehensive literature review of studies published between 1962 and 2024 on cranberry metabolites and their role in UTI prevention. The review indicated that cranberry metabolites, particularly A-type proanthocyanidins (PACs), flavonoids, and phenolic acids, can inhibit the adhesion of Escherichia coli to urinary tract epithelial cells, thereby reducing UTI recurrence.
Anti-adhesion activity, antimicrobial properties, antioxidant effects, and anti-inflammatory activity are key mechanisms underlying cranberry's potential to prevent or alleviate UTIs. Cranberry bioactive compounds therefore show considerable potential in UTI management.
Bioactive cranberry compounds against UTI pathogens
Source: Frontiers in Nutrition
In addition, microbial metabolism is a necessary step in mediating the preventive effects of cranberry PACs against UTIs, with the gut microbiota playing a key role. Cranberry PACs, particularly those containing A-type linkages, are poorly absorbed in their intact form. Gut microorganisms can metabolize them into lower-molecular-weight metabolites, such as lactones and phenolic acids. These metabolites exhibit anti-adhesion bioactivity in urine, thereby effectively helping to reduce UTIs.
The role of the gut microbiota in producing metabolites from cranberry compounds
A six-month double-blind study showed that women with a history of recurrent UTIs who took 500 mg of cranberry powder daily experienced a 52% reduction in UTI risk.
2. Cranberry: The "Ruby of North America"
Cranberries are small, bright-red, round berries with smooth surfaces and firm flesh. They have a sweet-tart flavor and have been cultivated for more than 200 years. As one of three major health-promoting fruits native to the United States, cranberries contain abundant bioactive compounds, including proanthocyanidins, anthocyanins, and phenolic acids. They are also known as the "Ruby of North America."
Proanthocyanidins (PACs), also known as condensed tannins, are phenolic compounds. They are widely recognized internationally as among the most effective natural antioxidants for scavenging free radicals in the human body. Their content in fresh cranberries can reach 34.3 mg/100 g, making them one of the most important bioactive constituents of cranberries. Unlike those found in other berries, the proanthocyanidins abundant in cranberries include PACs with anti-bacterial adhesion properties.
Quercetin is a major flavonoid found in cranberries, with a reported content of 25 mg/100 g. It has notable antioxidant activity and can inhibit the initial oxidation of low-density lipoprotein (LDL) cholesterol, thereby reducing triglyceride levels in the blood and contributing to cardiovascular health.
In addition, cranberries contain numerous other bioactive constituents, including resveratrol, lignans, pectin, ellagic acid, ursolic acid, and tocotrienols. These compounds offer potential nutritional value and health-promoting benefits.
3. Other Potential Health Benefits of Cranberries
1) Potential Benefits for Gynecological Conditions
Vulvovaginal candidiasis (VVC) is a common gynecological condition primarily caused by Candida albicans. Excessive use of antifungal drugs can contribute to increasing drug resistance, creating a need to explore alternative approaches.
Experimental results showed that PACs significantly inhibited the activity of Candida albicans within 48 hours. The inhibitory effect was stronger when PACs were used in combination with Lactobacillus plantarum.
Antifungal activity of probiotics and PACs against Candida albicans
2) Supporting Vaginal Health
Research has shown that cranberry oil can reduce inflammation in epithelial cells and tissues, including the vaginal epithelium, with IL-8 reduced by 33% and TNF-α reduced by 32%. It also reduced oxidative stress, with reactive oxygen species (ROS) decreasing by 43%, and reduced sodium dodecyl sulfate (SDS)-induced skin irritation by 24%.
Furthermore, cranberry oil can effectively inhibit the concentration of pathogenic vaginal microorganisms and help balance the gut microbiota. In view of its nutritional benefits, cranberry oil has potential as an ingredient in intimate care products.
3) Potential to Delay Aging
Aging involves a series of declines in physiological function as organisms grow older and is closely associated with oxidative stress and telomere shortening.
Research has indicated that cranberry concentrate (CBC) may exert anti-aging effects by regulating the body's redox status and protecting telomeres. Compared with grape seed extract, which is widely recognized by consumers for its anti-aging potential, CBC demonstrated more favorable effects in regulating glutathione peroxidase (GSH-Px) activity and protecting telomeres. These findings suggest that CBC has considerable potential as a functional food ingredient for supporting healthy aging.
4. Market Development of Cranberry Products
As cranberry product offerings have expanded and public awareness of cranberries has increased, both product trial rates and purchase rates have risen. North America is the primary region for cranberry cultivation and sales, harvesting approximately 200 billion cranberries annually, with annual sales exceeding US$1.5 billion.
Growing consumer awareness of the potential health benefits of cranberries has also contributed to the development of the cranberry dietary supplement market.
References
[1] Jangid H, Shidiki A, Kumar G. Cranberry-derived bioactives for the prevention and treatment of urinary tract infections: antimicrobial mechanisms and global research trends in nutraceutical applications. Frontiers in Nutrition. 2025;12.
[2] Wu Y-R, Chen J-S, Chen L-C, et al. Synergistic Inhibition of Candida albicans by Cranberry Proanthocyanidins and Probiotics: Novel Strategies for Vulvovaginal Candidiasis Treatment. Pathogens. 2025;14(4).
[3] Boira C, Jolibois J, Durduret A, Tiguemounine J, Szewezyk C, De Tollenaere M, Reynaud R. Cranberry oil: A potent natural intimate care ingredient displaying antioxidant and anti-inflammatory effects and promoting beneficial vaginal lactobacillus. International Journal of Molecular Sciences. 2025;26(5):2176.
[4] Wei Y. Study on the In Vivo Anti-Aging Function of Cranberry Concentrate Rich in A-Type Proanthocyanidins [D]. Zhejiang University, 2017.