Can I Take These?

Can You Take Calcium and Vitamin K Together?

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

No documented interaction identifiedEvidence: Moderate

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

What the interaction means

The NIH ODS calcium fact sheet names dolutegravir, levothyroxine, lithium, and quinolone antibiotics as its documented drug interactions -- vitamin K is not among them. MedlinePlus's vitamin K page does not mention calcium.

No documented interaction between Calcium and Vitamin K 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

Calcium's NIH ODS fact sheet and MedlinePlus's vitamin K page were checked directly, full text, in both directions. Vitamin K is not among calcium's named interaction concerns.

What the sources say

Calcium — Consumer — NIH Office of Dietary SupplementsVitamin K — MedlinePlus, U.S. National Library of Medicine

Last reviewed 2026-08-25

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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