Can You Take Iron and Zinc Together?
Separate zinc when elemental iron is 25 mg or more.
The short answer
A high-dose iron supplement taken with zinc may reduce zinc absorption.
Why it happens
NIH notes that 25 mg or more of elemental iron taken with zinc can reduce zinc absorption and zinc levels in the body.
What to do
Check the elemental iron amount on the label. If it is 25 mg or more, take a separate zinc supplement at another time. Ask a doctor or pharmacist if you are treating an iron or zinc deficiency.
Who this matters most for
This mainly concerns people taking a standalone, higher-dose iron supplement — 25 mg or more of elemental iron — alongside a separate zinc supplement. It is less relevant to the smaller amounts of iron and zinc found together in an ordinary multivitamin or in fortified foods, since the concern NIH describes is specifically tied to that higher iron dose taken at the same time as zinc.
How to actually schedule it
Start by reading the label of your iron product for the elemental iron amount, since that is the number that matters, not the total tablet weight. If it is 25 mg or more, keep your separate zinc supplement for a different time of day rather than taking both at once. If you are not sure whether your iron or zinc levels need correcting in the first place, or you are treating a diagnosed deficiency in either mineral, ask a doctor or pharmacist before changing how or when you take them.
When this advice applies
This effect mainly concerns high-dose iron supplements taken at the same time, not the smaller amount of iron in ordinary fortified foods.
Common questions
Does taking zinc with iron reduce zinc absorption?
It can, but mainly when the iron dose is high. NIH notes that 25 mg or more of elemental iron taken at the same time as zinc can reduce zinc absorption and lower zinc levels in the body. Lower iron doses, such as those in a typical multivitamin, are less of a concern.
How do I know if my iron supplement counts as high-dose?
Check the elemental iron amount printed on the supplement label, not the total weight of the iron compound. If elemental iron is 25 mg or more, treat it as the dose this guidance is about, and take a separate zinc supplement at another time of day instead of with that dose.
Do I need to separate iron and zinc if I'm treating a deficiency in both?
Ask a doctor or pharmacist rather than deciding on your own. Treating iron and zinc deficiency at the same time involves balancing two needs, and a clinician can advise on dosing and timing based on your specific levels and the products you are using.
References
- Zinc — Health Professional Fact SheetNIH Office of Dietary Supplements · 2026
Updated July 31, 2026 · How to use this guidance