@Kelwar Sorry to keep adding to this, and I know you will think I'm being a PITA, but it is probably best if you read the whole paper that I linked to, as the dosage is mentioned several times. At the top of Page 4, it says this (which has nothing to do with a 45mgs dose.)
Start of quote
Vaginal administration of progesterone within HRT regimens
Micronised progesterone can be also administered through the vaginal route although there is limited evidence assessing the efficacy and the optimal regimen of vaginal progesterone administration in the context of HRT.
In the UK, vaginal micronised progesterone preparations that offer the doses
commonly used within HRT include 100 mg vaginal progesterone tablets (Lutigest) and 200 mg vaginal pessaries (Utrogestan or Cyclogest).
The latter combinations are not licensed for use as HRT but can be used off-license to provide the progestogen component of HRT in women who
experience progestogenic side-effects with oral intake.
In addition, in women who do not tolerate oral progesterone intake, vaginal administration of oral micronised progesterone preparations (Utrogestan
100 mg capsules licences for oral use) can be considered on exceptional basis.
This will be off-license of the products and there is no available evidence on the absorption kinetics of progesterone preparations intended for oral intake when administered vaginally. ^Such intake should follow the same
doses recommended with oral intake^.
end of quote