Progesterone reduces rate of early preterm birth in at-risk women, study suggests

A new study has found that progesterone, a naturally occurring hormone, reduced the rate of preterm birth before the 33rd week of pregnancy by 45 percent among one category of at-risk women. The women in the study had a short cervix, which is known to increase the risk for preterm birth. The cervix is the part of the uterus that opens and shortens during labor.

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