There are two primary reasons people use aromatase inhibitors; to maintain normal estrogen levels when on-cycle and to help restore the HPTA during PCT. The most common reason is to help mitigate estrogenic side effects when using aromatizable drugs, although medical research has shown A.I.'s to be capable of eliciting dramatic increases in testosterone during PCT, similar to what is witnessed with S.E.R.M's, such as Clomid and Nolvadex. Such an increase is excellent and with A.I.'s and S.E.R.M.'s working through different mechanisms, combining the two during PCT provides superior results compared to using either one alone. An added benefit of A.I.'s are their ability to increase free testosterone. Up to 98% of all the testosterone in the human body is bound by SHBG in the same way that A.I.'s bind to estrogen. Of the 2% that is available for use, a portion of it converts to both estrogen and DHT. By lowering the conversion rate to estrogen, a larger percentage of testosterone remains metabolically active and able to attach to the androgen receptor. This increase in free testosterone increases the muscle building capacity of testosterone, per mg injected (or any other aromatizable steroid).
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