What's happening
High-dose calcium supplements can interfere with zinc absorption.
Recommendation
If taking both, separate timing or ensure adequate zinc intake.
Timing
Separate by 2 hours if taking high doses
Sources
- — Journal of Nutrition
calcium and zinc
Calcium may reduce zinc absorption
Frequently Asked Questions
Can I take calcium and zinc together?
Calcium may reduce zinc absorption. If taking both, separate timing or ensure adequate zinc intake.
How should I time calcium and zinc?
Separate by 2 hours if taking high doses
Is this interaction dangerous?
This interaction is rated “Caution” by Formulate. High-dose calcium supplements can interfere with zinc absorption.
Want to check your whole stack?
The free checker lets you add any combination of supplements and medications at once. Formulate's desktop app goes further — every stack change surfaces interaction alerts automatically.
Medical disclaimer. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.