Can you take Omega-3 Fatty Acids (EPA/DHA) with Vitamin K antagonists?
This is general information, not medical advice. Supplements can interact with medicines and health conditions. Always check with your doctor or pharmacist before starting or changing supplements.
What the evidence says
Omega-3 fish oil has its own mild antiplatelet effect, so combining it with a vitamin K antagonist like warfarin can, in theory, add to bleeding risk on top of the medication's own anticoagulant effect. The evidence for this in practice is mixed: a case report described a patient's INR rising from 2.8 to 4.3 after she doubled her fish oil dose to 2,000 mg/day, but a larger retrospective study of 573 warfarin users found fish and krill oil use did not significantly change time-in-therapeutic-range or bleeding rates at typical doses. Omega-3 is not a reason to avoid warfarin, but if you take both, keep your dose consistent, mention it to whoever manages your INR monitoring, and get an INR check if you change your omega-3 dose meaningfully or notice unusual bruising or bleeding.
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We check against a limited set of medications. Absence of a warning here is not evidence of safety. Always confirm with your pharmacist.