sentences:  Cyproterone acetate-containing birth control pills seem to decrease total and free IGF-1 levels.Combinations containing third- or fourth-generation progestins, including desogestrel, dienogest, drospirenone, or norgestimate, as well as birth control pills containing cyproterone acetate or chlormadinone acetate, are preferred for women with acne due to their stronger antiandrogenic effects.Studies have shown a 40 to 70% reduction in acne lesions with combined birth control pills.