Can You Take Melatonin and Vitamin K Together?
No documented interaction was identified between melatonin and vitamin K in the sources reviewed.
See the full Melatonin page and Vitamin K page for other reviewed interactions and reference information.
What the interaction means
NCCIH's melatonin page names exactly two classes needing medical supervision -- epilepsy and blood thinner medications -- and vitamin K fits neither. MedlinePlus's vitamin K page does not mention melatonin.
No documented interaction between Melatonin 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
NCCIH's melatonin page and MedlinePlus's vitamin K page were checked directly, full text, in both directions. Vitamin K is not an anticoagulant/antiplatelet drug or an epilepsy medication, so melatonin's two named caution classes do not apply.
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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