Evening primrose oil provides women with Gamma Linolenic Acid (GLA), an omega-6 fatty acid converted in the body to prostaglandins - types of enzymes that have been shown to balance female reproductive hormones and support a wide range of bodily functions, including moisture regulation of mucous membranes.

For women trying to conceive, the key benefit of evening primrose oil and GLA is its function in lubricating and maintaining mucus membranes and production, thus helping their bodies naturally regulate the ideal quality of fertile cervical mucus. One of the main features of healthy, abundant cervical mucus during the fertile period before ovulation is its ability to sustain sperm in a healthy medium and to allow sperm to move freely through the "hostile," or pH-challenged, environment of the cervix. During ovulation, healthy fertility relies on the change in texture and increase in amount of a woman's cervical mucus (often referred to as "egg-white" cervical mucus because of its ideally more stretchy and diluted quality).

Evening Primrose Oil should only be taken during the pre-ovulation period of each cycle (from the first day of menstruation until ovulation is assumed or confirmed to have taken place)