well estrogen naturally raises in your system when the testosterone does, its the bodies way of balancing itself out. However, you do in fact NEED estrogen to build muscle, without it your gains wouldn't be that great. Now going into PCT is a different issue, estrogen levels go down much slower than test does, and since pro-hormones are essentially mimicing anabolics, they cause the body to shutdown natural production of test, so by taking SERMS like Nolvadex and Chlomid, you get the anti estrogen effect, balanced out test levels and your balls workin again to produce test naturally and not rely on an outside source for test.
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