Does Calcium interact with Magnesium Glycinate?

Written to our editorial standards · reviewed against published research· Updated 2 Jun 2026
Space them apart· moderate evidence

Large calcium and magnesium doses can compete.

At high doses, calcium and magnesium use some of the same transport in the gut, so taking large amounts of both at the same moment is a little less efficient. Around the ratios found in most supplements and foods this is rarely a real issue.

What to do

Modest doses together are fine. If you take large therapeutic amounts, split them across the day, and take magnesium in the evening, where it doubles as sleep and muscle-relaxation support. Favour food sources of calcium where you can.

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Calcium
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Magnesium Glycinate
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Common questions

Can I take Calcium and Magnesium Glycinate together?
Space them apart. Modest doses together are fine. If you take large therapeutic amounts, split them across the day, and take magnesium in the evening, where it doubles as sleep and muscle-relaxation support. Favour food sources of calcium where you can.
Why do Calcium and Magnesium Glycinate interact?
At high doses, calcium and magnesium use some of the same transport in the gut, so taking large amounts of both at the same moment is a little less efficient. Around the ratios found in most supplements and foods this is rarely a real issue.

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Educational use only, not medical advice. Interaction risk depends on dose, your health, and any medications. Always consult a qualified clinician, especially if you take prescription drugs or are pregnant or nursing.