Effect of vitamin C supplements on urinary oxalate and pH in calcium stone-forming patients.

Background: The contribution of ascorbate to urinary oxalate is controversial. The present study aimed to determine whether urinary oxalate and pH may be affected by vitamin C supplementation in calcium stone-forming patients.

Methods: Forty-seven adult calcium stone-forming patients received either 1 g (N=23) or 2 g (N=24) of vitamin C supplement for 3 days and 20 healthy subjects received 1 g.

Effects of an oxalate load on urinary oxalate excretion in calcium stone formers.

Objective: To investigate the oxalate intake and the effect of an oxalate load on urinary oxalate excretion in calcium stone-forming (CSF) patients.

Design: Prospective study.

Setting: University-affiliated outpatient Renal Lithiasis Unit.