Maximum strength Cold Pressed GLA Evening Primrose OilContains Vitamin B which contributes to the regulation of hormonal activity Rapid release soft gel capsules Not all fatty acids can be made in the body so must be supplied through diet or supplementation. Holland & Barrett Evening Primrose Oil 1,500mg Plus Vitamin B6 provides the fatty acids Linoleic Acid (LA) and Gamma Linoleic Acid (GLA). Within the body Linoleic Acid is metabolised to GLA, which is essential for the production of certain hormone-like substances called prostaglandins. Also contains Vitamin B6 which contributes to the regulation of hormonal activity.