Can You Take Caffeine and Vitamin K Together?
No documented interaction was identified between vitamin K and caffeine in the sources reviewed.
See the full Caffeine page and Vitamin K page for other reviewed interactions and reference information.
What the interaction means
MedlinePlus's vitamin K page does not mention caffeine. MedlinePlus's caffeine page does not mention vitamin K or clotting.
No documented interaction between Caffeine 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
Vitamin K's and caffeine's MedlinePlus pages were checked directly, full text, in both directions. Caffeine's documented effects (stimulant, diuretic, gastric acid increase) do not overlap with vitamin K's clotting-factor role.
What the sources say
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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