Contraceptive+pills

====Some scientists had isolated and determined the structure of the steroid hormones and found that high doses of androgens, estrogens or progesterone ovulation. But obtaining them from European pharmaceutical companies produced from animal extracts was extraordinarily expensive. ==== ====In 1939, [|Russell Marker], a professor of organic chemistry at [|Pennsylvania State University], developed a method using sarsapogenin from sarsaparilla, which proved too expensive. After three years of extensive botanical research, he discovered a much better starting material, the saponin from inedible Mexican yams found in the rain forests of Veracruz near Orizaba. The saponin could be converted in the lab to its aglycone moiety diosgenin. Unable to interest his research sponsor [|Parke-Davis] in the commercial potential of synthesizing progesterone from Mexican yams, Marker left Penn State and in 1944 co-founded Syntex with two partners in Mexico. ==== ====European pharmaceutical companies on steroid hormones, reducing the price of progesterone almost 200-fold over the next eight years. Midway through 20th century, the stage was set for the development of a hormonal contraceptive but pharmaceutical companies, universities and governments showed no interest in pursuing research. ====  [] this invention has been very important to prevent a unwanted pregnancy,with this the women can control fertility, especially the teens who are getting pregnancy early. But the contraceptive pills can bring risks too, like to increase the risk of cancer.