Progesterone is a hormone which involved in the menstrual cycle in women, particularly in helping to build up the rich tissue layer in the uterus in preparation for an implanted embryo.
Progestin is a term which is used to cover a group of synthetic drugs which have progesterone-like effects.
Progestin (or progesterone) is also used to treat menstrual disorders, such as abnormal bleeding).
by Catherine E. Myers. Copyright © 2006 Memory Loss and the Brain