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If you take fish oil supplements, you might want to check which brand you use. A report from Labdoor, an independent testing company, has found that from the 60 popular brands they tested, 10% of those supplements were found to be rancid.
The reports found that in a large amount of supplements being sold they can have heavily oxidized oils, which can make them rancid in their taste, smell, and will have poor quality. According to Complex, Some of those brands that were tested were found to have oxidized oil levels 11 times higher that what is recommended.
If you want to learn more, check out The Guardian.