http://articles.mercola.com/sites/articles/archive/2003/02/26/progesterone-births.aspxThe hormone progesterone can help prevent premature births in a large number of high-risk pregnancies. The study found that 306 women who were injected with 17-alpha-hydroxprogesterone caproate (17P), a derivative of the hormone progesterone, once a weekenCommunityServer 2008.5 SP1 (Build: 31106.3070)