3 doctors weighed in:

What is most likely to occur when a calcium supplement and an iron supplement are taken simultaneously?

3 doctors weighed in
Dr. Quang Nguyen
Internal Medicine - Endocrinology
1 doctor agrees

In brief: Decrease absorption

In low dose, nothing probably will happen.
Calcium and iron are taken together in a multivitamin all the time. At higher dose, you might get GI upset. Regarding efficacy, you get less iron absorption if taken with calcium. It is recommended to take iron 2 hr before or 4 hr after calcium supplementation.

In brief: Decrease absorption

In low dose, nothing probably will happen.
Calcium and iron are taken together in a multivitamin all the time. At higher dose, you might get GI upset. Regarding efficacy, you get less iron absorption if taken with calcium. It is recommended to take iron 2 hr before or 4 hr after calcium supplementation.
Dr. Quang Nguyen
Dr. Quang Nguyen
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Dr. Richard Mcgee
Internal Medicine - Hematology & Oncology

In brief: Poor iron absorption

The concern is that the calcium salt can combine in the stomach/ intestine with the iron in a way that makes the iron less available for absorption.
So separating them in time by hours will avoid the issue mostly.

In brief: Poor iron absorption

The concern is that the calcium salt can combine in the stomach/ intestine with the iron in a way that makes the iron less available for absorption.
So separating them in time by hours will avoid the issue mostly.
Dr. Richard Mcgee
Dr. Richard Mcgee
Thank
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