Can You Take Casein Protein and Creatine Together?

Dose or timing may matter

The short answer

Casein protein yields high nitrogen waste (urea) requiring renal clearance, and creatine adds creatinine clearance demands. Together they amplify the kidney's filtration workload.

How to arrange timing

Ensure water intake exceeds 3 L/day. Both are generally safe for healthy kidneys, but combined high doses require attention to hydration.

Reference

Reference noted for this combination: Martin WF et al. Nutr Metab. 2005;2:25; Kreider RB et al. J Int Soc Sports Nutr. 2017;14:18

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.