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The best time to take iron and calcium in pregnancy

Updated 25 Oct 2026

Taking iron and calcium in pregnancy is very important, but taking them the right way matters even more.

Calcium: it's best to take calcium 1 hour after breakfast and lunch. Take no more than 500mg of elemental calcium at a time, because that is the most our bodies can absorb at once.

Don't take it in the evening or afternoon, as calcium may build up and increase the risk of other problems such as kidney stones and constipation, and typically trouble sleeping and restlessness.

Also, if you take calcium in the morning, your body is exposed to sunlight, which makes calcium absorption many times more effective.

Iron: iron is absorbed best on an empty stomach, so take iron about 30 minutes before a meal.

The best time to take an iron supplement also depends on your body. If you feel nauseous after taking it, take iron before going to bed.

On the other hand, if you often get heartburn, don't take iron before going to bed!

So, taking iron and calcium in pregnancy is very important, but taking them the right way matters even more. We hope these tips on iron and calcium supplements in pregnancy from Momby help you feel more at ease on your pregnancy journey.

References: tudu.com.vn

Sources

Content advised by our doctors.

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This article helps you understand and prepare. It does not replace a check-up. For an answer about your own situation, please ask the doctor who is caring for you.

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