What is Purified & Clear Omega 3 Fish Oil? Doctor's Best Purified & Clear Omega 3 Fish Oil contains certified pure Southern Pacific Anchovy oil, which is produced by a patented, state-of-the-art filtration process, resulting in a very low TOTOX value (indicator of marine oil freshness). The lower the TOTOX value, the better the quality of the oil. The light color is also an indication of its purity. The sustainably-sourced clear omega 3 fish oil has full traceability of its high purity and quality, and contains a minimum of 800mg EPA and 400mg DHA per serving. Total Omega-3 fatty acids support the heart, eye, brain and joint health.