Krill oil is a natural lipid extract derived from Antarctic krill (Euphausia superba), characterized by its high content of omega-3 fatty acids, particularly eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), predominantly in phospholipid-bound form for enhanced bioavailability. It also contains the potent antioxidant astaxanthin, which imparts its distinctive dark red or reddish brown color. Chemically, it presents as a transparent oily liquid with a low melting point, potentially appearing as a solid, liquid, or semi-solid depending on environmental conditions. Analytical confirmation includes infrared (IR) spectrum and nuclear magnetic resonance (NMR) conforming to the expected structure. Widely utilized as a specialty chemical in dietary supplements, pharmaceutical formulations, and biochemical research due to its anti-inflammatory properties, cardiovascular support, joint health benefits, and role in reducing oxidative stress. It is preferred over fish oil for its superior absorption and stability against oxidation.