Evening Primrose Oil (EPO) contains an omega-6 fatty acid called Gamma Linoleic Acid (GLA), that the body converts into a hormone-like substance called prostaglandin E1 (PGE1). Research shows that people who supplement with EPO have lower instances of PMS, diabetes, eczema, ADD (Attention Deficit Disorder), IBS & the symptoms associated with hormonal imbalance, like hot flushes, tension & irritability. Bio Nutrition Evening Primrose Oil is cold pressed, meaning no heat or chemical solvents are used to extract the oil. This ensures that the full benefit of the GLA found in EPO is maintained. These 500mg Evening Primrose Oil capsules provide 10% GLA to produce a fantastic effect on hormone balance, maintain a healthy glowing skin, increase circulation & stimulate the immune system. EPO is often taken by women just before the onset of their monthly periods to be of most help!