The composition of the invention, liposomal glutathione in combination with clopidogrel has utility for improving the efficacy of clopidogrel in preventing the aggregation of platelet that can lead to clotting. The prevention of platelet aggregation has widespread utilization in many cardiovascular conditions such as coronary artery narrowing and more consistent “antiplatelet” activity is found with the invention, the combination of clopidogrel and liposomal reduced glutathione.