Fish oil is one of suplement recommended for healthy diet for it is contains of the omega-3 fatty acids, eicosapentaenoic acid(EPA), and docosahexaenoic acid (DHA), precursors to eicosanoids that reduce inflammation throughout the body. Fish itself do not produce omega-3 fatty acids, but instead of accumulate them from either consuming microalgae that produce these fatty acids, as is the case with fish like herring and sardines, or as is the case with fatty predatory fish, by eating prey fish like mackerel, lake trout, fluonder, albacore tuna and salmon may be high in omega-3 fatty acids, but due to their position at the top of the food chain, these species dan accumulate toxic substances. For this reason, the FDA recommends limiting consumption of certain fish species (e.g. albacore tuna, shark, and swordfish) due to high levels of toxic contaminants such as mercury, dioxin, PCBs and chlordane. There are vegetarian, DHA Omega-3 products made from algae available if toxic contaminants are of concern.