Some of you may have seen the latest headlines stating that progesterone in the pill may cause cancer. Please do not be confused by the incorrect use of the terminology used when referring to the synthetic progestogens used in the pill or HRT which does carry a risk of cancer. These types of progestogens have their own generic names, but are frequently and erroneously termed with the name progesterone. There is much evidence to show that natural progesterone, synthesised in the body or in the laboratory, does protect against cancer and does not carry any of the risks associated with the synthetic forms. There is no progesterone in any contraceptive pill or HRT, only the synthetic and molecularly modified progestogens that can cause harm.
Please read these articles (here and here) I posted in May 2001 Also please see CANCERactive’s comments at http://www.canceractive.com/page.php?n=708