Can I Take These?

Can You Take Calcium and Metformin Together?

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

No documented interaction identifiedEvidence: Low

What the interaction means

Metformin's FDA label mentions calcium only once, as a risk-modifying factor for its separately-documented vitamin B12 interaction: "Certain individuals (those with inadequate vitamin B12 or calcium intake or absorption) appear to be predisposed to developing subnormal vitamin B12 levels." This is not a standalone metformin-calcium interaction claim -- it describes calcium status as one factor influencing metformin's already-known effect on vitamin B12, not an interaction between metformin and calcium itself. Calcium's own NIH fact sheet does not mention metformin.

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

See the separate, fully-documented Metformin + Vitamin B12 interaction for the actual interaction this calcium mention relates to. This record exists so the metformin-calcium pair itself has an honest, sourced answer rather than appearing unreviewed -- it is not evidence of a direct calcium-metformin interaction.

What the sources say

Calcium — Consumer — NIH Office of Dietary SupplementsMetformin Hydrochloride Tablets, USP — FDA Prescribing Information — Granules Pharmaceuticals Inc. (via DailyMed, U.S. National Library of Medicine)

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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