Cranberry juice is recommended in health medicine for treating urinary tract infections and bladder problems, and is effective (Weiner & Weiner 1994). Cranberry not only kills the bacteria causing infections, but also prevents them from sticking to cells. Cranberry juice and cranberry extract pills are being used in bodybuilding to 'detoxify' the kidneys.
I cannot see a role in sports per se, but forget the pills, and, as cranberry juice also contains lots of other useful nutrients and anutrients, it cannot hurt to have a glass now and again.
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