2026/10/04 07:24
Nutritionist Qiu Shixin said that preventing recurrent urinary tract infections cannot be achieved by just buying a bottle of cranberry juice and drinking it. Reminder that when choosing cranberry products, special attention should be paid to the key ingredient 1; diagram. (Picture taken from freepik)
[Health Channel/Comprehensive Report] "Urinary tract infections were rare in the past, but after menopause, you often get the lottery?" Nutritionist Qiu Shixin explained that after women's menopause, estrogen decreases, the mucosa around the vagina and urethra becomes thinner, and the local protective flora will also change accordingly, resulting in an increased risk of infection. Studies have pointed out that if you have recurring infections, regular intake of cranberry extract capsules, whole fruit powder, etc. can reduce the risk of recurrence by about 26%. However, the effective dose in the study is about 36 mg of PAC per day, which does not mean drinking a cup of commercially available cranberry juice will help. In addition, he also reminded that it cannot replace formal treatment for acute infections.
Decline in estrogen and changes in physiological structure
Qiu Shixin pointed out in a Facebook fan post that in addition to being related to bone mass and cardiovascular health, estrogen also plays an important role in the balance of the urogenital tract mucosa and local flora. The decrease in estrogen after menopause will have an impact on the mucosa around the vagina, urethra, and local protective flora. Therefore, the increased risk of urinary tract infection compared with before menopause is not due to bad luck, but to changes in physiological structure.
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When it comes to protecting the urinary tract, diet or supplement, cranberries are one of the most discussed options. Qiu Shixin pointed out that a comprehensive analysis of healthy women with recurrent urinary tract infections found that regular intake of cranberry-related products, such as extract capsules, whole fruit powder, etc., can reduce the risk of recurrent urinary tract infections by about 26%. In addition, a randomized controlled trial in 2025 allowed women with a history of recurrent infections to supplement 500 mg of whole cranberry fruit powder every day. The results showed that the incidence of culture-confirmed urinary tract infection was significantly reduced compared with the placebo group.
Drinking commercially available cranberry juice may be less effective
However, you can’t just buy a bottle of cranberry juice and drink it to achieve the effect. Qiu Shixin said that commercially available cranberry mixed juices may have problems such as added sugar, diluted concentrations of active ingredients, and lack of clear labeling of proanthocyanidin (PAC) content. Most of the products used in studies are standardized extracts or whole fruit powders, which is why some people still suffer from repeated infections after drinking cranberry juice every day because cranberry juice is not a type that has been verified by research.
Proanthocyanidin content is one of the key
In addition, Qiu Shixin reminded that when choosing cranberry products, special attention should be paid to the PAC content. The dosage range where a clear effect has been seen in the study is approximately above 36 mg of PAC per day (the relevant trial use range is about 36-72 mg/day). Before purchasing, be sure to turn to the ingredient label on the back and look for the "proanthocyanidins" or "PAC" label and number. If it only says "cranberry extract ○○ mg" without indicating the purity of the PAC, it is difficult to estimate the actual active ingredients based on the total weight of the extract.
Emergency medical treatment is required. Category 2 people must be careful
Qiu Shixin concluded that women who are troubled by recurrent urinary tract infections after menopause and women who are prone to recurrent infections before menopause are suitable priority supplements. However, if symptoms of infection have occurred, such as burning sensation, frequent urination, and fever, you should still seek medical treatment as soon as possible to evaluate whether antibiotic treatment is needed. You cannot rely solely on cranberries. In addition, those who take anticoagulant drugs such as warfarin or have a history of kidney stones must first ask their doctor whether supplementation is suitable.
