Do you have patients with recurrent calcium oxalate kidney stones stop taking supplements containing vitamin C if their 24 hour urine oxalate excretion is normal?  

No. I am not aware of data that suggests Vitamin C would aggravate kidney stone formation in this situation.  Stephen B. Erickson, MD

I agree with Dr. @Erickson. Typical multivitamins have 250-500mg of vitamin C, and in the example given, hyperoxaluria is not a concern. Hyperoxaluria is more typically associated with higher doses of vitamin C (1,000mg per day or more, sometimes much more), so I warn patients against excess vitamin...