Laura D.K. Thomas and colleagues at the Karolinska Institutet in Stockholm, Sweden, evaluated whether ascorbic acid supplements -- a form of vitamin C of approximately 1,000 milligrams -- were associated with the formation of kidney stones in a group of men in Sweden.
The study involved 48,850 men ages 45-79 years at baseline. The study participants were part of a study group who were recruited in 1997 and who provided detailed diet and lifestyle data in a questionnaire.
During 11 years of follow-up, there were 436 incident cases of kidney stones.
The study, published in the journal Internal Medicine, found ascorbic acid use was associated with a statistically significant two-fold increased risk of kidney stones. However, multivitamin use was not associated with kidney stone risk, the study said.
McPhee, Cokas 'working on their marriage' after affair
LGBT community has 'bullied the American people': Bachmann