Can You Take Vitamin C and Whey Protein Together?

Dose or timing may matter

The short answer

High-dose vitamin C produces oxalate while whey protein increases urinary urea and calcium excretion. Together they may elevate kidney stone risk through multiple pathways.

How to arrange timing

Keep vitamin C below 1,000 mg/day. Maintain hydration and consider periodic urinalysis if using both regularly.

Reference

Reference noted for this combination: Thomas LD et al. JAMA Intern Med. 2013;173(5):386-388; Reddy ST et al. Am J Kidney Dis. 2002;40(2):265-274

Important context

Whether supplements suit you together also depends on dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.