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A 2022 have a look at determined that some of products on the market used oxidized oils, with the rancidity often masked via flavorings. Another study determined that 2015 an average of 20% of merchandise had excess oxidation. Whether rancid fish oil is harmful stays doubtful. Some research show that notably oxidized fish oil could have negative impact on cholesterol levels. Animal testing confirmed that high doses have poisonous outcomes. Furthermore, rancid oil is possibly to be less effective than clean fish oil.