Omega-3 fatty acids is an important class of polyunsaturated fatty acids that have a variety of benefits for human health. They mainly include alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA). The human body cannot synthesize omega-3 fatty acids on its own, so they must be consumed through diet or supplements.

The main sources of omega-3 fatty acids include fatty fish (such as salmon, mackerel, trout, sardines, sturgeon, lake trout, and tuna), certain vegetable oils (such as flaxseed oil, canola oil, olive oil, and soybean oil), nuts (such as walnuts), and algae. They have positive effects on cardiovascular health, brain function, vision, anti-inflammatory effects, the immune system, and more.

Research shows that omega-3 fatty acids can help reduce the risk of cardiovascular disease, improve symptoms of depression, promote joint health, support prenatal and postpartum health, increase bone density, and may even help fight cancer. In addition, omega-3 fatty acids are also essential for children's brain development and vision development.

Since the modern diet may lack sufficient omega-3 fatty acids, especially EPA and DHA, omega-3 supplementation may be beneficial for most people. Omega-3 in supplement form, such as fish oil, krill oil, and algae oil (suitable for vegetarians), can be used as a supplemental source to the diet.