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Pregnenedione  ·  Progesterone, (13 alpha,17 alpha)-(+-)-Isomer  ·  Progesterone, (9 beta,10 alpha)-Isomer

Progesterone (P4) is an endogenous steroid and progestogen sex hormone involved in the menstrual cycle, pregnancy, and embryogenesis of humans and other species. It belongs to a group of steroid hormones called the progestogens, and is the major progestogen in the body. Progesterone has a variety of important functions in the body.