Evening primrose oil contains high levels of essential fatty acids (EFAs). These fatty acids are necessary in the production of prostaglandins, which are hormone-like substances. These substances are vital in regulating different systems in the body, including your oil glands. Therefore, getting an adequate supply of EFAs can actually help to reduce oiliness. See Essential fatty acids—yum for more information.
If you decide to try evening primrose oil, you’ll have to experiment with dosage to find what works for you. For PMS and cramping, I would take 1-2 500 mg capsules morning and night at the onset of ovulation and increase the dosage to maybe 3-4 capsules twice daily until the end of my period. For problem skin, you might try 2 capsules twice daily. If you don’t notice improvement, try up to 4 capsules two times a day and see if that brings about a positive change in your skin.
Evening primrose oil is also another hangover helper. Six to ten capsules taken before bed on a night you had (perhaps too much) alcohol will go a long way to reduce the symptoms of a hangover. (See Holiday Hangover Helpers.)