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Cranberry juice retains a considerable reputation as both prevention and treatment for urinary tract infection (UTI) in women, despite the fact that studies frequently have failed to support its use. One common explanation for the negative data is the low concentrations of proanthocyanidins contained in both juice and cocktail (these molecules inhibit Escherichia coli adhesion in vitro and are thought to be responsible for the berry's postulated antiseptic effects). Might concentrated cranberry capsules perform better?
Researchers randomly assigned 185 female nursing home residents to take two cranberry capsules or placebo daily for 1 year; the total amount of proanthocyanidins contained in two cranberry capsules was equivalent to that in 20…