Nourish your body with GLA. Evening Primrose Oil is revered as a source of Gamma-Linolenic Acid (GLA), which is created in the body from essential healthy fats like those found in flaxseed. For people who don’t adequately produce GLA, Barlean’s Evening Primrose Oil offers a direct source. Studies have found that taking daily doses of Evening Primrose Oil may decrease the severity of cyclical breast pain, reduce hot flashes and relieve PMS symptoms.