While salmon oil and deep sea fish oil belong to the same category of fish oil, deep sea fish oil is extracted from common miscellaneous fish, including woodchuck and sardines. Salmon oil is generally extracted from salmon and is the most authentic fish oil. It contains valuable Omega unsaturated fatty acids essential to a healthy diet, including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which have the effect of regulating blood lipids, lowering triglycerides, and thinning blood.