Evening primrose oil (EPO) is a source of the omega-6 fatty acids gamma-linolenic acid (GLA) and linoleic acid (LA). Omega-6 fatty acids and substances made from them, are components of nerve cells, all cell membranes and hormone-like substances known as prostaglandins. Prostaglandins have multiple local hormone-like actions, which include regulation of tissue inflammation. Low levels of GLA have been found in women with premenstrual syndrome (PMS). Essential fatty acid deficiency can lead to an excess of the female hormone prolactin which is responsible for many of the symptoms of PMS. Supplementing with EPO increases a prostaglandin known as PGE1, which may help with the symptoms of PMS. Product Usage Adults - Take 1 to 3 capsules daily with meals, or as professionally prescribed. Children 6-12 years. As professionally prescribed. Storage Condition Store below 30°C in a dry place, away from direct sunlight Warnings May occasionally cause mild gastrointestinal symptoms or headacheAlways read the label. Use only as directedIf symptoms persist