Evening Primrose Oil is a rich source of Omega-6 essential fatty acids, which, as the name implies, are essential to good health.Essential fatty acids can help the body maintain a normal inflammatory response and ensure the health of cells.Evening primrose oil contains a compound called GLA, which is a building block for hormone-like compounds.Evening primrose is also used by some people to help soothe certain skin issues, such as scaliness.It’s an herd native to North America, and has a long history of use among Native American tribes as a food and medicine.Some people refer to Evening Primrose Oil simply as EPO.