Look into these people ive heard great things about them. There located in Australia but they might have sister companies around the world. Hope this helps.
www.perthbraincentre.com.au
www.perthbraincentre.com.au
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You are right to be hesitant. And progesterone is so safe that the only real problem it can cause is messing up the monthly cycle. But that doesn't seem relevant to you. You can safely the hundreds of milligrammes a day.