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Diosgenin is a steroid sapogenin which is isolated from the wild yam. It Can be converted to synthetic pregnenolone and progesterone. Binomial name Dioscorea villosa This is a species that is found wild in the United States. ... Pregnenolone is a steroid hormone involved in the steroidogenesis of progesterone, mineralocorticoids, glucocorticoids, androgens, and estrogens. ... Progesterone is a C-21 steroid hormone involved in the female menstrual cycle, pregnancy (supports gestation) and embryogenesis of humans and other species. ...