The oil of the Evening Primrose seed is a rich source of cis-g-linolenic acid (GLA). GLA is a precursor of a hormone-like substance called PGE1 which has a wide range of beneficial effects in the body. Those with premenstrual syndrome- diabetes and eczema- can have a metabolic block that interferes with the body’s ability to make GLA. Many people in Western societies may be at least partially GLA deficient as a result of aging- glucose intolerance- dietary fat intake- and other problems. Sona Evening Primrose Oil 500mg capsules are made with the highest quality- cold pressed oil- with a Guaranteed 10- GLA (Gamma Linolenic Acid) content in clear gelatine capsules.