Does Iron Bisglycinate interact with Magnesium Glycinate?

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

Iron and magnesium can compete for absorption.

Both are positively charged minerals that share some of the same gut transport, so large supplemental doses taken together can modestly reduce how much of each you absorb. At the smaller amounts in food or a multivitamin this barely matters.

What to do

If you take therapeutic doses of both, separate them: iron in the morning on an empty stomach with vitamin C, and magnesium in the evening, where it also helps sleep. Pairing iron with vitamin C matters far more than avoiding magnesium.

Learn more
Iron Bisglycinate
Full guide →
Learn more
Magnesium Glycinate
Full guide →

Common questions

Can I take Iron Bisglycinate and Magnesium Glycinate together?
Space them apart. If you take therapeutic doses of both, separate them: iron in the morning on an empty stomach with vitamin C, and magnesium in the evening, where it also helps sleep. Pairing iron with vitamin C matters far more than avoiding magnesium.
Why do Iron Bisglycinate and Magnesium Glycinate interact?
Both are positively charged minerals that share some of the same gut transport, so large supplemental doses taken together can modestly reduce how much of each you absorb. At the smaller amounts in food or a multivitamin this barely matters.

Explore further

Check your whole stack at once

Paste everything you take, our free checker flags every interaction, redundancy, and timing issue.

Run the free interaction checker →

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.