I found DHB to be similar to masteron’s SERM-like e2 properties. It’s very androgenic, and that probably lessened high e2 symptoms without reducing total estradiol.

My boyfriend @Aggieguy might have some better insights tho. He loves DHB

You may have heard that it is chemically similar to primo which is true. But superdrol is chemically even closer to Masteron and those drugs behave quite differently.

DHB isn't an estrogen-lowering drug and isn't an estrogen receptor blocker. I have not used it yet, I have a good stockpile and will incorporate it into my next cycle. From what ive read, I do not plan or running too high of a dose, 200- 300 mg alongside 500-ish mg of Test.
Comparing the 2, DHB: More aggressive and generally regarded as the more potent muscle/strength builder. Produces relatively dry, dense-looking gains, but tends to come with a rougher side-effect/tolerability profile.
Primo: Milder and slower-building. Known for gradual, lean gains with relatively little water retention and generally better tolerability.

The two are not comparable. Like Mast, DHB MIGHT lower e2 for SOME users but its not universal.

I am currently on 300mg of DHB weekly, just started week 9. My cycle consists of Test, DHB, and Primo. I am liking the results. The cycle started a zero pip but slowly got worse over time. Currently I sit on ice packs to ease the PIP, although it hasn't gotten bad enough to want to quit.

If you plan on using DHB as an AI, like one would for Primo, then you are going to be disappointed and going to have an high e2.