In several large studies in which 5-10 g of vitamin C were given daily to healthy humans for several years, no adverse effects were demonstrated, other than occasional nausea, loose stools, and diarrhea.1617 Although reports have warned of an increased risk of kidney stones with high intakes of vitamin C (oxalate is a metabolite of ascorbic acid), large doses of vitamin C do not increase oxalate excretion into the urine and do not contribute to kidney stones in healthy people.6 However, in pa tients with a history of kidney stones high doses of vitamin C should be taken only under their doctor's supervision. There is no evidence to support contentions that high doses of vitamin C can cause conditioned scurvy.17 High doses of vitamin C may decrease copper absorption, and chewable forms of vitamin C, because of their acidity, can cause erosion of dental enamel.17

51 Tips for Dealing with Kidney Stones

51 Tips for Dealing with Kidney Stones

Do you have kidney stones? Do you think you do, but aren’t sure? Do you get them often, and need some preventative advice? 51 Tips for Dealing with Kidney Stones can help.

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