Evening Primrose Oil is a natural source of the unsaturated fatty acid, gamma linolenic acid (GLA).GLA is a precursor to prostaglandins, action-specific biomolecules that regulate many important functions in cells. Royal Brittany Evening Primrose Oil is the best product of its kind on the market. The Evening Primrose used for Royal Brittany is 100% natural, organically cultivated on protected, pesticide-free growing fields. Not only is the cold pressed Royal Brittany Evening Primrose Oil void of hexane and all other solvent residue, it is also free of toxic erucic acid which is present in many other gamma linoleic acid (GLA) and linoleic acid (LA) products. The GLA and LA ingredient dosage provides conformity in each softgel. The consistency of potency is guaranteed by assay. Royal Brittany Evening Primrose Oil assures quality, reliability, and purity.