Evening Primrose Oil provides gamma-linolenic acid (GLA), linoleic acid and other important fatty acids. Evening Primrose Oil is the most researched source of GLA. All of the fatty acids in Evening Primrose Oil play a major role in supporting heart, skin, cell membrane and nerve health. As a supplement, it can offset the body's declining ability to convert linoleic acid into gamma-linolenic acid. Our Evening Primrose Oil is non-GMO and tests below detection limits for pesticides and herbicides.