The health benefits of fish oil mainly come from EPA and DHA, which can lower blood lipids and improve brain function. Because they are highly unstable and prone to oxidation in the air, fish oil is generally encapsulated. In the United States, fish oil sells well because it is more convenient and cheaper than eating fish, and there is no need to worry about fish contamination (as polluted heavy metals are mainly found in the fish meat).
In fact, eating fish is better for human health than taking fish oil. In addition to fish oil, fish is also rich in high-quality protein, vitamins, and minerals. Studies have shown that the effect of 300mg of DHA in fish is equivalent to 600mg of DHA in fish oil. This may be because the DHA in fish works synergistically with other nutrients to enhance its effectiveness. In China, fish oil is not cheap, so eating fish directly is a better choice. You can choose "fattier" fish, such as sardines, carp, catfish, flounder, black carp, trout, tuna, and salmon, which contain relatively more fish oil.