Gamma linolenic acid or GLA is the main component of evening primrose oil, black currant oil, and borage oil. GLA is an omega-6 fatty acid that is hard to come by in the diet. It is an effective anti-inflammatory agent with none of the side effects of anti-inflammatory drugs. It also promotes healthy growth of skin, hair, and nails. I prescribe it frequently for skin conditions (including brittle nails and hair), arthritis, autoimmune disorders, and premenstrual syndrome. Do not expect immediate results; it takes six to eight weeks to see changes after adding GLA to the diet. These three products vary in the amount of GLA they supply and in cost.