Cod liver oil is a natural lipid mixture extracted from the livers of Atlantic cod (Gadus morhua). It is rich in omega-3 polyunsaturated fatty acids, including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), as well as fat-soluble vitamins A (retinol) and D (cholecalciferol). This product serves as an analytical reference standard for quality control, spectroscopic analysis (e.g., IR and NMR), and research in pharmaceutical, nutritional, and biochemical applications. Its composition makes it valuable for studying lipid metabolism, vitamin bioavailability, and as a component in formulating supplements or fortified products. Not intended for direct human consumption without further processing and regulatory approval.