Correction: I just looked and he doesn't actually give the name of the researcher who said that, but he says it was someone who was on his podcast within the last 2 weeks. Here is an excerpt:
"I don’t want to scare people, but it’s important that I bring this out we’re talking on the show. I just did a podcast two weeks ago with the researcher. Not a named person, so it doesn’t need a name who he is. His company has been doing a lot of research with cardiologists. They’ve been looking at men on therapeutic testosterone. They are finding that there are issues in the vascular pathways from men that are on AI’s. He referred to them as microblisters in certain vascular pathways that can lead to, technically, an MI. Anyway, bottom line is if you’re doing this right, you should not use or block your estrogen when you’re on testosterone. The one thing, Ben, that most people get confused is they think that testosterone causes, if you don’t block your estrogen, that the high estrogen effects, meaning it’s high estrogen symptoms of an elevated estrogen e2 level, which, again, is estradiol, is causing the side-effects that they think are from high estrogen. It’s not, Ben. It’s from insulin resistance and visceral fat. If you’re a dude, you got a belly, you’re on testosterone, you don’t block your estrogen, and then you feel like you have high estrogen in your mind because you’ve been told that this is high estrogen symptoms, it’s not the truth. The symptoms that you’re feeling are from your insulin resistance and your visceral fat deposition. That’s what causes high estrogen effects. The truth is you should have your estrogen between 60 and 80 or higher when you’re on testosterone to confirm minimum protective effects to your heart. Of course, all the other things we talked about."