Vitamin Warning

Vitamin C in high doses may cause kidney.

Recent finding: People who took 2,000 milligrams (mg) of vitamin C per day—many times higher than the recommended daily intake—for six days had a 10% or more increase in levels of urinary oxalate, a building block of kidney stones. If you want to take vitamin C, keep the dosage under 500 mg a day to minimize risk of calcium oxalate kidney stones.