What are the reported benefits and adverse effects of fish oil

Fish oils are used primarily in the treatment of hyperlipidemia, hypertension, and chronic inflammatory states such as rheumatoid arthritis and autoimmune disease. Fish oils contain two long-chain omega-3 fatty acids that compete with arachidonic acid in the cyclooxygenase and lipoxygenase pathways and have antiinflammatory effects, likely caused by the inhibition of leukotriene synthesis. Fish oils decrease blood viscosity and increase red blood cell deformability. The antithrombotic activity offish oils results from prostacyclin inhibition, vasodilation, reduction in platelet count and adhesiveness, and prolongation of bleeding time. Concomitant use of fish oils and anticoagulant and antiplatelet drugs previously mentioned may increase the risk of bleeding.

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