Erase pro is not an AAS...it does not require a PCT...it's actually used by a lot of people for PCT. Basically, in generic terms its an oestrogen blocker...when test levels rise the body compensates by converting test to estrogen to balance your hormones. We both know this is bad for muscle building...estrogen also causes water retention under the skin...
The other ingredients in erase pro are different than the original erase....the "dual phase modulation matrix" are added to keep your body in out of a catabolic (muscle breakdown) state and to burn unnecessary fat. A lot of people say ErasePro is good but some swear by the original because you can alter your dosages...75mg of Androsta 3,5 is a lot for some people and they experience joint pain because of the dryness of the joints....
Also a lot of people stack erase/ErasePro with a natty test boosters...elevated test with decreased estrogen and cortisol levels are ideal scenarios for building muscle.
Basically, this site
http://pescience.com/products/erase-pro/ explains it all..