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Although acute vitamin B-6 deficiency increases urinary oxalate excretion, the effects of marginal vitamin B-6 status are unknown. Mild vitamin B-6 depletion was induced in eight healthy young women by feeding a low vitamin B-6 lacto-ovo-vegetarian natural foods diet for 27 days. The basal diet contained 0.45 mg vitamin B-6 and 1.55 g/kg body weight protein. Although measures of vitamin B-6 status...