I will be the first to say I am not sure, but in my posts asking about comparing 1-test to Trenbelone (fina) I was told they are similar. Also based on Biotest suggesting 2 week cycles, I have a suspicion that this stuff is pretty supressive. If it is even HALF as nasty as what tren was for me..it is bigtime suppressive. I am ordering my One next week, and I intend on clomid post cycle. To me, it is better safe than sorry, because I know with Tren, that stuff knocked my boys for a major loop after only 6 weeks.