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Background: Platelet hyperactivity has a crucial role in initiating vascular thrombosis and subsequent cardiovascular disease (CVD).Objective: This study aimed to assess the effect of anthocyanins (AC) on platelet aggregation and activation and lipid profile.Study Design: A total of 26 healthy participants consumed 320 mg of AC/day in the form of Medox® capsules for 28 days.Setting: This study was conducted in the laboratories of the School of Medical Sciences, Griffith University, Gold Coast, Australia.Participants: A total of 26 randomly recruited healthy 25- to 75-year-old participants completed this study.Primary Outcome Measures: Fasting blood samples were collected pre- and post-the intervention period to perform platelet activation studies by measuring platelet surface marker expression of CD41a and P-selectin, and platelet-monocyte aggregates in adenosine diphosphate (ADP) stimulated platelets. Platelet aggregation studies were performed by stimulating platelets with various agonists such as ADP, collagen and arachidonic acid. Full blood examination, coagulation and biochemistry profile analyses were also performed pre- and post-intervention. Flow cytometric analysis showed a significant effect of AC on the expression of P-selectin as measured by the platelet surface expression of CD62p.Results: There was a significant reduction of ADP-stimulated platelet aggregation. Hematologic analysis showed a significant reduction of mean platelet volume, mean cell hemoglobin, and mean cell hemoglobin concentration. Coagulation analysis demonstrated significant attenuation of fibrinogen level in the blood.Conclusion: This study showed inhibition of platelet activity, platelet aggregation and mean platelet volume (MPV). These results suggest that AC has a positive impact on attenuating platelet activity, which might minimize thrombotic risk. [ABSTRACT FROM AUTHOR]