Nature's Logic North Atlantic Sardine Oil is derived from harvested wild sardines, which are small planktivorous pelagic fish. This brilliant gold oil is by far the most popular oil used in dietary supplements as a source of the Omega-3 fatty acids EPA and DHA. It contains more EPA and DHA than salmon oil and has naturally lower levels of environmental contanimants. This human and pharmaceutical-grade sardine oil is purified so the levels of lead, mercury, arsenic and cadmium are less than one part per million. By supplementing Nature's Logic North Atlantic Sardine Oil, you are adding one of nature's most bio-available sources of nutrients to your pet's diet.