A bit of back-story: I was started on oral estrogen at 17, had SRS at 24, and continued on oral estrogen until my mid 40s when my GP felt the risk of long-term estrogen therapy was too high. After about 15 years, I became concerned and asked for a referral to a knowledgeable endocrinologist. The endocrinologist is one of the most experienced and knowledgeable in this part of the country and she was immediately shocked that I had been without HRT for over 10 years. As she suspected, I had some bone density loss from lack of primary hormones and she started me on transdermal estrogen immediately. She said that oral estrogens simply don't provide blood serum estrogen levels in the normal female range. She said the patch is more effective and is not processed by the liver which also makes it safer. With hormone levels in the normal range and with regular exercise, I beat the osteoporosis. I asked how long I should stay on the patch and she said that when I stop, the osteoporosis WILL come back but the dangers of continuing HRT long-term are statistically small. I feel better and look younger than I have in decades so I will take my chances with statistics!
A couple of years ago I decided I wanted to lactate - one of the aspects of womanhood that I had never experienced but was still possible. Knowing I had never been exposed to progesterone and therefore lacked the "maturity" of the milk-making apparatus, I discussed taking progesterone with my endocrinologist but she said I didn't "need" it because I didn't have a uterus (which I DO, but that's beside the point LOL!) but I decided to continue on my own and take a six month course of high level progesterone (Microgest) to simulate pregnancy (while being monitored by my endocrinologist).
I got more than I bargained for! Within 4 months I was experiencing just about every symptom of pregnancy that it is possible to experience without a fetus present! Unfortunately the depression got pretty bad (one of the known side-effects of progesterone), bad enough that I discontinued the Microgest.
A month or so later a partner came into my life who was interested in an ANR ("adult nursing relationship") so I started progesterone again for a month, then discontinued it while taking domperidone and herbs to stimulate lactation. My endocrinologist indicated that my prolactin levels were high, almost as high as a nursing mother, and within a couple of weeks I was producing milk. Unfortunately the relationship crashed and burned a couple of months later and I discontinued all medications (except the patch).
Anyway, significant changes occurred while I was taking Microgest.
1 - My breast size increased nearly 2 cup sizes
2 - My aerola and nipples increased in size and the aerola became darker
3 - The texture of my breasts changed. I can feel the lobules (where milk is produced) and still can after many months
4 - My natural background level of moisture (in the genitalia) increased as well as the lubrication produced when aroused.
5 - My breasts are more dense, firm, and heavier than before
Considering all the positive side-effects I advised my endocrinologist that I intend to stay on cyclic progesterone for the foreseeable future. It may not be "necessary" but, for me, it was very beneficial.