I first got to know the medicinal properties of this fruit (juice) just recently because a friend of mine drinks this to prevent bladder and urinary tract infections. And yes, there is a sound scientific basis to this.
A specific type of tannin found only in cranberries and blueberries interacts with the little projections on the Escherichia coli (E. coli) bacteria (the most common cause of UTI), preventing them from sticking to the walls of the bladder and causing infection.
If you’re up for more scientific reading, read the report from the American Academy of Family Physicians.
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