Why Vitamin C Is Linked to Kidney Stones
Swedish researchers have discovered that taking too much of one of the world’s most well-known vitamins may contribute to kidney stones. That would be vitamin C, which most of us get quite enough of every day from our food.
In a large study, conducted with over 23,000 men, the researchers found a link between kidney stones and taking 1,000 milligrams of vitamin C supplements every day. This link did not exist for multivitamins (which contain smaller amounts of vitamin C), but only for vitamin C supplements in particular.
About 436 of the 23,355 men in the study developed kidney stones bad enough to require a doctor. When the researchers analyzed the numbers, they found that men who routinely take vitamin C supplements (perhaps those who know their diet isn’t good, or who want to prevent a cold) had a 200% greater risk of kidney stones than men who didn’t take any supplements.
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