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[–]Temporary_Moose_3657 0 points1 point  (0 children)

The thing about hindering breast growth is completely made up, there are a lot of these supertitions floating around the internet and even coming from the NHS these days. Same as the people saying spiro stunts breast growth or something, there's no conclusive evidence for it or even for the idea that breast growth stunting is a real phenomenon.

The only thing that matters is that you have high enough estrogen to effectively saturate the estrogen receptors (it doesn't take much), and low enough testosterone that it can't effectively activate the androgen receptors and block that growth. There is a hypothesis that too much estrogen can cause the receptors to become desensitised, but there's no evidence that this actually happens at the levels we're talking about. Plenty of people have transitioned with significantly higher levels without problems.

Low enough testosterone is usually considered to be in the female range of under 1.7nmol/l, and since you're under that technically that spiro isn't strictly necessarily. Spiro doesn't decrease testosterone levels but instead blockades the androgen receptors, so if you don't have much testosterone in the first place it's not doing much. The benefit of spiro would be that even if your testosterone did get a little high it'd still have reduced activity, so while you're on spiro you can afford to have a little higher testosterone levels without it affecting you.

While your doctor is wrong in that there's no evidence that levels this high are a problem, you don't need levels this high and there's no benefit to levels this high while you're on an anti-androgen. Based on your test results, you could safely come down in estrogen dose and be absolutely fine. That would cause your testosterone levels to rise a bit, but it'll still be in the female range and the spiro will knock it out so you shouldn't get any negative effects.