Answers › Can you take iron and calcium together?
Can you take iron and calcium together?
This page hasn't been reviewed by a pharmacist yet. It's general information, not medical advice.
Short answer
NIH ODS says calcium might reduce iron absorption, and experts suggest taking individual calcium and iron supplements at different times of the day. This applies to separate supplements; it does not mean you need to avoid calcium-rich food. If you have been prescribed iron, ask your GP or pharmacist how to time it.
What the evidence says
NIH ODS notes that experts recommend taking calcium and iron supplements at different times to avoid potential interference with iron absorption. [1]
Australian upper limits
The adult upper level of intake is 45 mg/day for iron [2] and 2,500 mg/day for calcium (total intake including food). [3]
Multivitamins
Many multivitamins contain both. That is common and not covered by the "separate supplements" advice; ask your pharmacist if you also take a standalone iron product.
FAQ
How far apart should iron and calcium be taken?
NIH ODS says experts suggest taking them at different times of day but does not give a fixed gap. Ask your pharmacist for advice that fits your products.
Does milk affect iron tablets?
Dairy contains calcium. If you take an iron supplement, ask your pharmacist whether to take it apart from dairy.
Related
- How much zinc is too much? The Australian upper limit
- How much vitamin D is too much in Australia?
- Every source the Checker uses
Sources
- NIH ODS: Iron fact sheet for health professionals
- NHMRC Nutrient Reference Values: Iron
- NHMRC Nutrient Reference Values: Calcium
Sources checked 2026-10-18. Last updated 2026-10-18.