"The ingestion of cranberry juice significantly and uniquely altered three key urinary risk factors. Oxalate and phosphate excretion decreased while citrate excretion increased. In addition, there was a decrease in the relative supersaturation of calcium oxalate, which tended to be significantly lower than that induced by water alone. CONCLUSION: Cranberry juice has antilithogenic properties and, as such, deserves consideration as a conservative therapeutic protocol in managing calcium oxalate urolithiasis."
BJU Int. 2003 Nov;92(7):765-8. Influence of cranberry juice on the urinary risk factors for calcium oxalate kidney stone formation.
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