A study published in the MDPI journal Nutrients looks at the use of fish oil with warfarin and whether it significantly affects the INR or incidence of adverse events in patients. Warfarin is an anticoagulant often used to manage atrial fibrillation and deep vein thrombosis. However, patients have to be careful about drug interaction with warfarin. Fish and krill oil products are among the many complimentary medicines which have been flagged as having a potential interaction with warfarin. This study assesses the influence of fish and krill oil supplements on warfarin and looks at patients that took warfarin simultaneously with fish or krill oil. The result was that overall, the oils did not significantly alter the efficacy of warfarin.