Can You Take Caffeine and Calcium Together?
Yes. Caffeine can slightly reduce net calcium absorption, but the effect is usually small.
The short answer
Caffeine and calcium can usually be consumed together. The effect of caffeine on calcium absorption is small for most people.
Why it happens
NIH notes that caffeine slightly reduces net dietary calcium absorption. This does not mean that one cup of coffee cancels the calcium you consume that day.
What to do
A fixed gap is usually unnecessary. Focus on adequate daily calcium intake and follow the product directions for taking your calcium with or without food.
When this advice applies
If your caffeine intake is high, your calcium intake is low, or you have osteopenia or osteoporosis, ask a clinician or dietitian for individualized advice.
References
- Calcium — Health Professional Fact SheetNIH Office of Dietary Supplements · 2026
Updated July 31, 2026 · How to use this guidance