nolvadex will only block the estrogen receptors, not stop the conversion of androgens into estrogen, without the aromatase inhibitor (arimidex) you could still have an estrogen back lash at the end of your cycle. sust is supposed to aromatize less than the individual really long acting esters but it can still be a problem. post cycle your endogenous test. production will be nil so you will need to use HCG/clomid to maintain the gains you made. as for suppressing the estrogen sides you should start with a low dose of both anti-estrogen compounds and increase the dosages if your nipples start to itch or you notice that you are getting fat. for gaining mass a lot of people say that having some estrogen is good, but i agree with Tank that it is probably best to just avoid the problems. with a stack like that at good dosages and diet, training etc... you will make good gains and if your estrogen is low, you should really harden up