GLA (gamma-linolenic acid) is a fatty acid used by most cells to produce the soothing PGE1 prostaglandins. Many dietary and lifestyle factors can seriously reduce the body's GLA production. Borage seed oil provides one of the highest yields of GLA in the botanical kingdom (more than twice the GLA yield of evening primrose oil). The borage seed oil is extracted by a special cold-press process, which leaves no harmful residues and is HEXANE-FREE.