Evening primrose oil is often recommended for PMS as it is supplies the omega 6 fat GLA (gamma-linolenic acid), which women with PMS are often running low in. However, Borage seed oil (Starflower) is now considered to be a much better source of GLA. Supplement with Starflower oil to up your intake of this important fatty acid. In addition, omega 3 fats EPA & DHA (eicosapentaenoic acid & docosahexaenoic acid) found in rich supply in oily fish such as salmon, tuna and mackerel, can be helpful.