The last thing that any male bodybuilder or weight lifter wants to see is an increase in estrogen, which can lead to a term commonly known as "gynomastia". This occurs when too much estrogen is introduced into the body and reaches abnormal levels.
The best way to reduce estrogenic activity in the body is with the use of an anti-estrogen. This can be done either by reducing the amount of estrogen, or by reducing the activity of whatever estrogen is present.
There are many estrogen inhibitors on the market today. The best product to take is an aromatase inhibitor or Anti-Estrogen, because they bind to the same binding site on the aromatase enzyme that testosterone does. By this happening, they decrease the amount of testosterone that will bind to aromatase, which in turn leads to less estrogen conversion!