There is a longstanding belief among the mainstream medical community that vitamin C increases risk of kidney stones. "Reports of kidney stone formation associated with excess ascorbic acid intake are limited to individuals with renal disease". A 2003 review stated that "data from epidemiological studies do not support an association between excess ascorbic acid intake and kidney stone formation in apparently healthy individuals", although one large, multi-year trial published in 2013 did report a nearly two-fold increase in kidney stones in men who regularly consumed a vitamin C supplement.
there is a longstanding belief among the mainstream medical community that vitamin c increases risk of kidney stones "reports of kidney stone formation associated with excess ascorbic acid intake are limited to individuals with renal disease" a 2003 review stated that "data from epidemiological studies do not support an association between excess ascorbic acid intake and kidney stone formation in apparently healthy individuals" although one large multi-year trial published in 2013 did report a nearly two-fold increase in kidney stones in men who regularly consumed a vitamin c supplement