Hi Mary G
Yes it is the 8% Crinone, I don't think the other 4% is available any more. Yes, they come in boxes of 15, which is a months supply for me as I use it every other day.
I am not too worried about it not being licensed for HRT, as it is licensed for fertility treatment and so is obviously (to me) safe and probably safer than some of the synthetic alternatives that g.ps are happy to prescribe as it is bioidentical.
As for the dose, nobody knows what level of progesterone is required for protection against oestrogen (no studies). The crinone dose (90 milligrams every 2 days, or 45mg a day) is higher than a mirena coil (21 micrograms daily) so again I am not concerned that it is inadequate. It is less than utrogestan but via a different route, and perhaps that is why it is tolerable.