2. Fish oil is an oil extracted from fatty fish, which is rich in eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA, commonly known as brain gold) and various n-3 polyunsaturated fatty acids (n-3PUFA).

3. Fatty fish rich in omega-3 fatty acids include mackerel, tuna, salmon, sturgeon, anchovies, sardines, herring and trout. Among them, about 1g omega-3 fatty acids can be obtained every couple.

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