Look for fish oil that has been molecularly distilled to remove contaminants such as mercury, lead, and other heavy metals.
Check the label for the specific amounts of EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) - the key omega-3 fatty acids to ensure potency.
Opt for fish oil derived from sustainable and well-managed sources, such as wild-caught, smaller fish like anchovies, sardines, salmon, or mackerel.
Ensure that the fish oil is fresh and has not gone rancid, which can be indicated by a strong odour.
Look for fish oil that uses triglyceride (TG) form, as it's more readily absorbed by the body compared to ethyl ester (EE) form.