By Board Certfied Urologist Dr. Yana Barbalat
Scientific evidence shows that the consumption of cranberry juice does NOT increase urinary oxalate levels or increase the risk of stone formation. In fact, studies have shown that cranberry juice may suppress kidney stone formation by LOWERING urinary oxalate excretion and increasing citrate excretion, which tends to prevent stone formation.
It is difficult to make a blanket statement for all cranberry supplements because different supplement brands may contain different ingredients.
However, Utiva sends their capsules for third party testing to measure the oxalate levels of their 36 mg PACs supplements. This data shows that each supplement contains less than 0.5 mg of oxalate, a minimal amount, even for stone formers.