I'm going to stack it with sustain alpha.
I wouldn't advise stacking the two. SA has resveratrol, which is also an estrogen blocker. There will be more of a chance of an estro "rebound" if you take them simultaneously... and it could create an undesired effect on libido. Formestane is
very effective by itself, but if I were to stack it with something, it would be a test-booster without any ingredients that suppress estrogen. PP's Phyto Testosterone fits the bill nicely.
My $0.02
Btw, I've used both transdermal form and PP's LV version, and both are equally effective as far as results. The only difference I've noticed is that transdermal use gives me a subtle "rush" right after application. However, I prefer the convenience of PP's liquid.