Omega-3 fatty acids, mainly eicosapentaenoic acid and docosahexaenoic acid, can promote the reduction of triglycerides, which is beneficial to heart health and has therapeutic effects on many human diseases. Studies have also shown that omega-3 fatty acids are helpful to improve the symptoms of patients with rheumatoid arthritis and depression. Omega-3 fatty acids have anti-inflammatory, antithrombotic, hypolipidemic and vasodilative effects. Omega-3 fatty acids also play a certain role in treating and alleviating other diseases, including pain, diabetic kidney injury, obesity, skin diseases and so on.