Diets rich in omega-3 fatty acids have been shown to be cardio-protective; these diets decreased inflammation, platelet aggregation, cardiac arrhythmias, triglycerides, number of total LDL and small dense LDL particles, and increased omega-3 index, endothelial relaxation and atherosclerotic plaque stability. Most of the earlier studies regarding the effects of long chain n-3 PUFA on blood lipids were conducted with fish oils which contain a mixture of EPA and DHA. Recently a number of studies have been conducted with EPA and DHA individually. Results from studies with individual fatty acids show that EPA and DHA have similar effects on some of the lipid parameters, but they are assimilated to a different concentration in tissues and have different effects on lipoprotein particle size, heart rate and blood pressure. The main purpose of this study is to examine the effects of DHA supplementation on the above three risk factors.