What is fish oil used for?

Fish oil supplements contain omega-3 fatty acids. A primary use is to reduce triglycerides in the body and to protect against heart disease, heart attacks and strokes, according to Drugs.com. Since omega-3 isn't produced naturally in the body, it is necessary to get it from supplements or from eating fish.

People who take fish oil on a doctor's recommendation are also advised to eat a healthy diet and exercise regularly, reports WebMD. These patients also sometimes take prescribed medication to reduce heart-related health risks.

In addition to its applications in heart health, people use fish oils for conditions such as ADHD, depression and psychosis. There is some evidence to suggest that fish oil prevents or treats eye conditions. Women sometimes use fish oil to reduce pain during menstruation.