Does Caffeine Affect Calcium?

May affect absorption or how you feel

The short answer

Caffeine increases urinary calcium excretion and may reduce absorption.

How to arrange timing

Separate calcium supplements from caffeinated beverages by 2 hours.

Reference

Reference noted for this food and supplement combination: NIH ODS 2024

Important context

The effect can also change with food amount, supplement 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.