I'll try to answer some of this!
She was definitely influenced by the works of Katherine Dalton on progesterone, and possibly even Dr Lee. She argued that oral progesterone is destroyed in the stomach by acids (a popular opinion amongst ‘experts’ despite it still being prescribed) and is about 80% useless
Oral progesterone is not destroyed in the stomach and in fact the research says that taking with food increases bioavailability.
It is poorly absorbed generally which is why 200mgs (used to be 300mgs) is taken daily as part of some HRT regimes. It is certainly not useless. I've used it for 6 years and have uterine scans which show it works. It would not be licensed otherwise.
Yes I have read Whyte and disagree. There is no such thing as estrogen dominance . No current researcher / menopause specialist believes it. Meno symptoms occur when estrogen falls. Women who have had a hysterectomy and use estrogen only HRT do not need progestogens. Using estrogen only should- if you believe the dominance idea- make them feel terrible when in fact they feel great!
Some women have been prescribed progesterone creams by 'alternative drs' as part of HRT and there have been cases of hyperplasia because the cream is too weak and ineffective to prevent hyperplasia.
I think it's important to be sure we are talking about the same things.
In women who are young, there may be SOME positive response to using a progesterone cream but there is no real evidence it helps.
But the wild yam cream cannot be absorbed.
In women who are post meno and using estrogen as well, transdermal progesterone doesn't work and is dangerous.
In women who are in peri menopause, progesterone cream in its own won't do anything because the symptoms are due to low estrogen.
There is a huge amount of pseudo science around progesterone and a lot of people trying to make a lot of money out of it. It's a topic that comes up time and again on forums because women are hoping to find something 'natural'. All licensed HRT is 'natural' but it is in prescribed quantities and there are strict QC around it which you don't get with products bought OTC.