Castor oil has been traditionally used as a laxative and to induce labor. Many naturopathic doctors will recommend castor oil topically, as a heated pack, applied to the abdomen to regulate menses and to decrease pre-menstrual symptoms. It is also used to stimulate detoxification. Interestingly, researchers at the Max Plank institutes have recently discovered that the compound in castor oil, ricinoleic acid, induces G-coupled protein receptors, that which is involved in cellular communication, providing a mechanism of action for the effects of castor oil.
I recommend topical castor oil as one mean to favor the elimination of exogenous estrogen (or too much estrogen) from xenoestrogens, hormone disrupting agents, oral birth control pills, excessive caffeine consumption, low fiber diet, and lack of exercise. Estrogen dominance is a common cause of many health concerns – to name a few: Migraines, hypothyroid, PMS, dysmenorrhea, endometriosis, cancer, and pre-menopause irregularities.