Why do Magnesium and Calcium interact?

High doses of calcium can reduce magnesium absorption The interaction is moderate.

Magnesium + Calcium

Q: Can I take Magnesium with Calcium?

Usually yes, but not at the same time. High doses of calcium can reduce magnesium absorption Take at different times; magnesium in evening is ideal

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

Moderate InteractionIngredientMD curated

Magnesium and Calcium interact moderately. High doses of calcium can reduce magnesium absorption

Bottom line: Take at different times; magnesium in evening is ideal

How They Interact

High doses of calcium can reduce magnesium absorption

Timing

Take at different times; magnesium in evening is ideal

What to do about it

Take at different times; magnesium in evening is ideal

Evidence Sources

IngredientMD curated interaction database

Common Questions

Magnesium and Calcium have some interaction to consider. High doses of calcium can reduce magnesium absorption Take at different times; magnesium in evening is ideal

Compare Side-by-Side

Magnesium vs Calcium: what each one is for

Related Interactions

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

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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.