Source Naturals Flaxseed-Primrose Oil provides both omega-3, omega-6, and omega-9 essential fatty acids (EFA's). EFA's act as precursors to molecules such as prostaglandins, thromboxanes and leukotrienes, which help regulate cellular function. EFA's have been shown to play a role in blood pressure maintenance, sustaining healthy skin and providing nutritional support during women's cycles. Flaxseed oil, a rich vegetable source of alpha-linolenic acid (ALA), and evening primrose oil, a natural source of gamma-linolenic acid (GLA), provide a potent combination of EFA's.