Evening primrose oil is a natural oil extracted from the seeds of the evening primrose plant, which is native to North America. It is rich in gamma-linolenic acid (GLA), an essential fatty acid that plays a role in various bodily functions. People often use evening primrose oil as a dietary supplement for its potential health benefits, including support for skin health and hormonal balance. This oil is commonly available in capsule or liquid form and can be taken orally or applied topically. Some studies suggest that evening primrose oil may help alleviate symptoms of conditions like eczema and premenstrual syndrome (PMS). However, more research is needed to fully understand its effectiveness.