I don't blame you for not taking the progesterone pill from your Dr. as it is synthethic and I wouldn't be surprise if there are lots of other unhealthy things in it as well.

I use a natural progesterone cream (to balance my hormones) and so does one of my daughters who wasn't having periods. It took her a little while before she became regular, but now is.

There is a lot of information in Dr. John R. Lee's books-he has several-I read What your Dr. may not tell you about premenepause. He gives a list of several brands that he has checked for quality and content.

As far as I have nread and understand, you can use these as long as needed. It is very important these days (at least in the USA) to balance out the extra estrogens that we are exposed to as that is the cause for breast cancer and many other problems.