脂肪酸和二十碳五烯酸(EPA)存在於各種魚油中，尤其是在深海魚中。已有研究證明，DHA和EPA具有抗動脈粥樣硬化作用和明顯的降血脂作用。能抑制血小板聚集，減少血栓形成；DHA還可以增加大腦神經元的發育和功能。含有DHA和EPA的魚油制劑已被用於醫藥和保健食品。
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