Researchers believe the high GLA content of evening primrose oil regulates the production of prostaglandins, helping reduce the inflammation that can result from hormonal changes during menstruation. Women with conditions such as premenstrual syndrome (PMS) and polycystic ovarian syndrome (PCOS) often have low GLA levels, and it is common for women to experience unwanted symptoms around the time of their monthly period, including cramps, breast tenderness, and irritability. Some women find evening primrose supplements help relieve these symptoms.
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