Dietary Supplement. Promotes healthy skin & hormonal balance. Hexane-free! Health From The Sun Evening Primrose Oil naturally supplies the omega-6 fatty acid Gamma-Linolenic Acid GLA. GLA is an important fatty acid which is rarely found in foods. Evening Primrose Oil is extracted from the highest quality Evening Primrose seeds using the expeller-press method, without the chemical solvent hexane. Independently tested to guarantee purity and truth-in-labeling.