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

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 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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