Omega 3 capsules are fish oil supplements that the body needs to function properly. One capsule typically provides 300 milligrams of omega 3 fatty acids which can be broken down into alpha-linolenic acid, docosahexaenoic acid, and gamma-linolenic acid. These acids are important for heart health as well as brain health. Alpha-linolenic acid, the fatty acid that is most commonly found in fish oil and is also known as a precursor to the long chain omega 3 fats EPA and DHA, is what supports cardiovascular health.