It said the new analysis suggested cranberry juice provided "no meaningful protection" against cystitis.

BBC: Cranberry juice 'not effective' against cystitis

Cranberry juice is said to alleviate cystitis, a stinging inflammation of the bladder usually caused by a urinary tract infection (UTI).

BBC: Cranberry juice 'not effective' against cystitis

Researchers are also testing a number of other solutions that may help relieve the symptoms of interstitial cystitis, including hyaluronan, chondroitin sulfate and oxybutynin.

CNN: Interstitial cystitis

The first application, currently in clinical development, is to treat interstitial cystitis (IC), a painful bladder disease in women that forces them to urinate every 10 minutes.

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