January 2006 in “Xibei zhiwu xuebao” This study found that norethindrone and levonorgestrel affected Arabidopsis thaliana root growth differently depending on concentration, with levonorgestrel being highly active and most effective at promoting taproot growth at low doses.
62 citations
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December 1995 in “The Journal of Clinical Endocrinology & Metabolism” This study found that combining a GnRH agonist with a low-dose oral contraceptive was more effective in treating hirsutism than either agent alone and prevented hypoestrogenic side effects.
25 citations
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September 1977 in “Journal of Toxicology and Environmental Health” This study in female beagle dogs found that long-term exposure to oral contraceptive steroids resulted in significant reproductive and mammary gland changes, with the relevance to human tumor risk remaining uncertain.
24 citations
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July 1980 in “Journal of Toxicology and Environmental Health” This study found that feeding norethindrone acetate to albino rats over two years caused various dose-related health effects, such as growth retardation and liver changes, but did not increase overall tumor incidence.
March 2012 in “Journal of the American Academy of Dermatology” Treating ovarian-related inflammation may help hair regrowth in women with alopecia areata.