The ripe fruit is used. This antiadherence action renders the bacteria harmless in the urinary tract. Recently, the proanthocyanidins in the berry were shown to have this antiadherence action. 3 Cranberry has been shown to reduce bacteria levels in the urinary bladders of older women significantly better than placebo, which may help to prevent future infections. 4 Other preliminary studies in humans suggest cranberry can help people with urostomies and enterocystoplasties to keep them clear of mucus buildup.
Cranberry concentrate has no known side effects and is safe to use during pregnancy and lactation.
Cranberry should not be used as a substitute for antibiotics during an acute urinary tract infection. For the convenience of the reader, the information in the table listing the supplements for particular conditions is also categorized. Potential use for the treatment of urinary tract infections. Zafiri D, Ofek I, et al. Inhibitory activity of cranberry juice on adherence of type 1 and type P fimbriated Escherichia coli to eucaryotic cells.