Aromasin has several factors that make it a better choice as an ai, especially during pct because being a type 1(steroidal) because it doesnt lower the blood plasma levels of a serm ..type 2 ai's(non steroidal) substantially hinder serms .primarily nolva, from being effective. Aromasin also significantly lowers sbgh,(20%) while also balancing out your free to bound test ratio. It blocks 60% estro, and greatly increases natty test production..
Heres a bit more about aromasins benefits:
Aromasin is a type-I inhibitor, meaning that once it has done its job, and deactivated the aromatase enzyme, we don’t need it anymore. Letrozole and Arimidex actually need to remain present to continue their effects. This is possibly why Nolvadex does not alter the pharmacokinetics of Aromasin (11).
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Before we close the book on Aromasin, it’s worth noting that you can (and should) still use one of the non-steroidal AIs during your cycle to reduce estrogen, if necessary. When you are ready for PCT, you can then switch over to Aromasin and still experiejnce the full effects of an AI, since there is no cross-over tolerance experienced between steroidal and non-steroidal AIs (9). Since Aromasin is about 65% efficient at suppressing estrogen (10), it’s certainly a very powerful agent, especially considering you won’t experience reduced effectiveness because of your concurrent use of Nolvadex or from any sort of tolerance developed by using other AIs on your cycle(9). There is also a decent amount of preclinical data suggesting that Aromasin has a beneficial effect on bone mineral metabolism that isnot seen with non-steroidal agents, and it may also have beneficial effects on lipid metabolism that are notfound in the non-steroidal Letro and A-dex (9).