I just bought a testosterone booster that has a estrogen blocker in it called arimistane. Anyway I have been taking it for a couple days and really feel the test boost not only in the gym but in the sexual department as well. I def have stronger erections and my libido is better. I heard lowering E2 a little can decrease SHBG and that why I think its boosting my free testosterone. I also want to be careful because my E2 sensative test was at 17 last time I checked so do not want to crash my E2 taking but so far so good.