Human beings mainly absorb EPA and DHA from fish oils, among which the content of EPA and DHA is the highest in Marine fatty fish, some freshwater fish also contain a certain amount of EPA and DHA, and the content of EPA and DHA is less in other animal foods. Plant foods, on the other hand, do not contain EPA and DHA. EPA and DHA are both unsaturated fatty acids (omega*3), and their chemical names are eicosapentaenoic acid (EPA) and docosapentaenoic acid (DHA), respectively. Both of them are unsaturated fatty acids, and the molecular structure is very close, so EPA is easy to be converted into high-density lipoprotein (HDL) in the human body to play physiological functions.