Hi Babspiglet
Your post got missed - and I'm not sure if you've had an answer yet?
Although the licensed dose is for 100 mg daily when taken continuously ( or days 1-25 of 28 day cycle), this is for the oral dose. When i wrote to the previous manufacturers about 10 years ago they sent me the french info which said that if used vaginally the same dose should be used. However there is research from small trials that when taken vaginally a lower dose may be needed ( on average) to protect the womb as more of the progesterone goes to where it is needed. One of the studies did in fact trial alternate day vaginal progesterone dosing and found that the womb was protected when paired with low to medium doses of oestrogen.
Also Dr Louise Newson also does suggest this sometimes to her patients and in fact says as such on her website - though this is off licence and will very much depend on the individual women and the oestrogen dosage.
As you are on a low oestrogen dose then it may well be that you will be fine on alternate day vaginal progesterone but this should really be done in consultation with your GP or menopause speciliast who may suggest a scan if necessary. A warning that it might not be working would be any form of spotting or bleeding altough this is to be expected during the first 6 months of continuous HRT anyway.
I did a compilation of the studies into vaginal progresterone which i have both bumped and updated periodically and will try to do so for you so that you can read about it yourself.
Hope this helps and let us know how you get on
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Hurdity x