Why do Calcium and Iron interact?

Calcium blocks iron absorption by up to 50% The interaction is significant.

Calcium + Iron

Q: Can I take Calcium with Iron?

Not without care. Calcium blocks iron absorption by up to 50% Take at least 2 hours apart

Can you take Calcium and Iron together? Here's what the science shows.

Significant InteractionIngredientMD curated

Calcium and Iron have a significant interaction. Calcium blocks iron absorption by up to 50%

Bottom line: Take at least 2 hours apart

How They Interact

Calcium blocks iron absorption by up to 50%

Timing

Take at least 2 hours apart

What to do about it

Take at least 2 hours apart

This is a clinically significant interaction. Consult your healthcare provider before combining these.

Evidence Sources

IngredientMD curated interaction database

Common Questions

Calcium and Iron have some interaction to consider. Calcium blocks iron absorption by up to 50% Take at least 2 hours apart

Compare Side-by-Side

Calcium vs Iron: what each one is for

Related Interactions

Magnesium + Calcium Zinc + Copper Iron + Calcium Iron + Zinc Calcium + Vitamin D Magnesium + Vitamin D

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Every ingredient page carries the interactions, cautions and timing behind entries like this one.

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Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. Always consult with a healthcare provider before making changes to your supplement regimen, especially if you take medications.