i'm on yes for about 1 month and it's def working. i use alot though. 6 sprays a day, sometimes twice a day(12). i take off every 4th day. also using t rex, gluccorel r, sesapure, AIFM and tyler's. all kick ass. it's hard to tell what's really working but i think the yes and trex together is potent. i've been off cycle almost 1 month still on pct, and i'm exactly same weight as end of cycle but i'm leaner for sure and more veiny. AIFM keeping water away nice, 3 sprays a day in pct. then i'm going to 2 a day for month and then 1 a day for a month.