Can I Take These?

Can You Take Calcium and Magnesium Together?

No documented interaction was identified between calcium and magnesium in the sources reviewed.

No documented interaction identifiedEvidence: Moderate

See the full Calcium page and Magnesium page for other reviewed interactions and reference information.

What the interaction means

The NIH Office of Dietary Supplements' magnesium fact sheet names bisphosphonates, antibiotics, diuretics, proton pump inhibitors, and zinc in its interactions section -- calcium is not named. The calcium fact sheet names dolutegravir, levothyroxine, lithium, and quinolone antibiotics -- magnesium is not named.

No documented interaction between Calcium and Magnesium was identified in the authoritative sources reviewed. This is not a guarantee that no interaction exists for every dose, formulation, or individual -- it means the sources checked did not document one.

Practical context

Both substances' own current NIH fact sheets were checked directly and neither names the other.

What the sources say

Magnesium — Consumer — NIH Office of Dietary SupplementsCalcium — Consumer — NIH Office of Dietary Supplements

Last reviewed 2026-08-23

Medical information disclaimer: this information is general and educational. It does not diagnose conditions, prescribe treatment, or determine whether a combination is safe for you personally. Follow your prescription label and ask a pharmacist or clinician before starting, stopping, or combining products. Full disclaimer.

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