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Cod liver oil has moved from grandmother's remedy to clinical research subject, with recent studies continuing to validate its role in cardiovascular protection and immune function. Unlike standard fish oil, cod liver oil delivers a unique combination of omega-3 fatty acids—EPA and DHA—alongside naturally occurring vitamins A and D, making it especially relevant for populations at risk of nutrient deficiencies or those seeking consolidated supplementation. The science is compelling: a three-year interventional trial published in 2021 examined 870 patients at cardiovascular risk and found that daily cod liver oil supplementation reduced the incidence of myocardial infarction. Omega-3 fatty acids from marine sources have also been shown to reduce triglycerides by 15–30% and raise HDL cholesterol in multiple dose-response meta-analyses. Vitamin D, abundant in cod liver oil, continues to draw attention for its role in immune modulation, bone health, and potentially reducing the risk of acute respiratory infections. But not all cod liver oil is created equal. Extraction methods, sourcing, oxidation control, third-party testing, and omega-3 potency vary dramatically across brands. This ranked comparison evaluates real products available in 2026, prioritizing verifiable omega-3 content, independent lab certification, freshness protocols, and sustainability practices.