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Talking about pigs raised in China, I have heard about the term "lean meat powder". It is a chemical some pig farmers use to feed their pigs to make them grow more lean meat instead of grow fat. It is harmful to both the pigs and the humans who consume them later. Yes, it is illegal there but the lack of enforcement makes many laws useless in China.
Farm raised fish are usually less safe than the wild caught ones. As a fish keeper, I know so many chemicals (water conditioner, some fish meds, etc.) we often use in our aquariums have the labels of "not meant for fish raised for human consumption". In a money driving society, many fish farm owners could care less about these restrictions and all they want is to have the fish stay alive before they sell them. As for wild fish, I try to avoid the freshwater fish which are more likely from polluted water than the fish from ocean.
It is hard to check the source of ingredients. You might not even get the answer if you can contact the manufacturer.
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