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Clinical Nephrology
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Intake of Vitamins B6 and C and the Risk of Kidney Stones in Women

GARY C. CURHAN, WALTER C. WILLETT, FRANK E. SPEIZER and MEIR J. STAMPFER
JASN April 1999, 10 (4) 840-845;
GARY C. CURHAN
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WALTER C. WILLETT
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FRANK E. SPEIZER
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MEIR J. STAMPFER
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Abstract

Abstract. Urinary oxalate is an important determinant of calcium oxalate kidney stone formation. High doses of vitamin B6 may decrease oxalate production, whereas vitamin C can be metabolized to oxalate. This study was conducted to examine the association between the intakes of vitamins B6 and C and risk of kidney stone formation in women. The relation between the intake of vitamins B6 and C and the risk of symptomatic kidney stones were prospectively studied in a cohort of 85,557 women with no history of kidney stones. Semiquantitative food-frequency questionnaires were used to assess vitamin consumption from both foods and supplements. A total of 1078 incident cases of kidney stones was documented during the 14-yr follow-up period. A high intake of vitamin B6 was inversely associated with risk of stone formation. After adjusting for other dietary factors, the relative risk of incident stone formation for women in the highest category of B6 intake (≥40 mg/d) compared with the lowest category (<3 mg/d) was 0.66 (95% confidence interval, 0.44 to 0.98). In contrast, vitamin C intake was not associated with risk. The multivariate relative risk for women in the highest category of vitamin C intake (≥1500 mg/d) compared with the lowest category (<250 mg/d) was 1.06 (95% confidence interval, 0.69 to 1.64). Large doses of vitamin B6 may reduce the risk of kidney stone formation in women. Routine restriction of vitamin C to prevent stone formation appears unwarranted.

  • © 1999 American Society of Nephrology
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Journal of the American Society of Nephrology: 10 (4)
Journal of the American Society of Nephrology
Vol. 10, Issue 4
1 Apr 1999
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Intake of Vitamins B6 and C and the Risk of Kidney Stones in Women
GARY C. CURHAN, WALTER C. WILLETT, FRANK E. SPEIZER, MEIR J. STAMPFER
JASN Apr 1999, 10 (4) 840-845;

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Intake of Vitamins B6 and C and the Risk of Kidney Stones in Women
GARY C. CURHAN, WALTER C. WILLETT, FRANK E. SPEIZER, MEIR J. STAMPFER
JASN Apr 1999, 10 (4) 840-845;
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