I go back and forth on topical estrogen. I love Estrogel but I was using it essentially as a hair tonic on the entire scalp and often twice a day. I don't think this level of usage is possible without feminizing. Once my bald spot completely filled in, then I began using it more so only on the scalp's hairline and any thin spots still visible which became fewer and fewer. I have spent more money on Estrogel than I care to say but this was essentially my one year push and plan after several years of low-dose estradiol grew big breasts but very little hair.
I think hitting at least 300pg/ml might be necessary though to kick off re-growth but I and another similar person on HRT,
@bridgeburn, from the past who posted pics of similar improvement have probably been far north of 300pg/ml during our main courses of treatment. We both also used oral min and that might kick-start things as well. Bridge's thread is still up but he hasn't posted in a couple of years and nobody has filled the gap. People need to see progress over time to evaluate this and not think it is a hoax based upon lighting or going in reverse in pics or whatever. One before and after pic is unlikely to change anyone's opinion but even many MtF's continue to think that what I have done is or was impossible. I have also microneedled for almost two years weekly and never less than twice a month so that has helped too, I am sure:
Now I am trying P4 cream on my hairline and face and that is reputed to target both DHT and T but my restoration is probably too far along for me to tell. I also take 100mg daily of Prometrium. Bridge cycled three times as much but only for ten days.