Estrogen vs. Progesterone

In the 1930’s it was laboratory tested that estrogen, even in small quantities, produced abortions and when given early enough could prevent the implantation of the fertilized embryo.

Progesterone, though, in the 1940’s, was demonstrated to protect against the toxic effects of estrogen, including abortion, but it was also known as a natural contraceptive, since it prevents pregnancy without harmful side effects differently than estrogen, by preventing sperm entry into the uterus.

So, natural progesterone can prevent miscarriages which result from excess estrogen, but if used before intercourse, it prevents conception which is a true contraceptive, while estrogen is an abortifacient, not a contraceptive.

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