1. This study was undertaken to evaluate the effects of low dose ingestion of omega-3 fatty acids on clotting profiles in healthy men ingesting 3 g of MaxEPA (900 mg omega-3 fatty acids) daily for 30 days. 2. No effect was noted on either platelet aggregation or circulating prostaglandin levels. 3. Significant decreases were noted for total cholesterol and low density lipoprotein. 4. Clotting factor decreases were noted for factors primarily of the intrinsic pathway and several factors which promote fibrinolysis. 5. The data suggests that low level ingestion of marine fish oil has a beneficial effect on lipids and possibly the clotting profiles in healthy men.