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We studied the effect of oral calcium supplementation in patients with enteric hyperoxaluria. Three patients with renal stone events following ileal resection were given oral calcium supplement. One of the three patients was put on a low-fat diet. The treatment reduced urinary oxalate excretion to the normal range. Subsequently, 2 patients reduced the dose of calcium supplementation at their own discretion and consequently developed renal stones again together with hyperoxaluria. Based on these observations, we believe that an adequate dose of calcium can normalize urinary oxalate excretion. [ABSTRACT FROM AUTHOR]