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Thank you for your inquiry. Our oil is regularly tested for mercury, PCB's and other toxins. All levels are below the method detection limit, meaning that the levels are so low that they cannot be detected. Because our oil is from all wild Alaskan salmon it is inherently free of the toxins that you are more likely to find in farmed fish and farmed fish products. Please contact us with any additional questions at info@grizzlypetproducts.com