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Can You Take Iron and Calcium Together?
Possibly. Calcium might interfere with iron absorption, so experts suggest taking calcium and iron supplements at different times of day.[1]
Based on NIH Office of Dietary Supplements — Iron fact sheet · Updated October 10, 2026
Calcium may interfere with iron absorption[1]
Calcium might interfere with iron absorption, though this hasn't been definitively established; experts suggest taking calcium and iron supplements at different times.
Take calcium and iron supplements at different times of day.
Source [1]Iron: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. (ods.od.nih.gov)
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- Does Salt Affect Calcium?Yes. A high sodium intake increases the calcium lost in urine, so eating less sodium means less calcium lost.
- Should You Take Vitamin D With Calcium?Vitamin D is needed to absorb calcium, and bone needs both: low calcium and/or vitamin D contributes to osteoporosis.
- Does Caffeine Affect Calcium Absorption?Slightly. Caffeine reduces calcium absorption to a small extent; low vitamin D status reduces it more.
- Do Iron and Manganese Compete?They are linked: iron deficiency raises manganese absorption and can make manganese toxicity worse.
- Does Vitamin A Help Iron?Vitamin A is needed to mobilise iron, so if iron and vitamin A are both short, address both.
- Does Riboflavin (Vitamin B2) Help Iron?Riboflavin is needed to use iron, so check riboflavin sources such as dairy, eggs and fortified grains when iron is short.
Sources
- Iron: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. ods.od.nih.gov
This page is general information from the cited sources, not medical advice. If you take prescription medication, are pregnant, or manage a health condition, check supplement changes with a pharmacist or doctor.