Epistane is an oral AAS. It is mild but not dont mean that it will go so easy on your liver. Methyl attached at the 17a position if thats what your asking? Im no chem expert. But post cycle is reccomended because on any AAS your hormones will be outta wack afterwardsd no matter what properties the AAS contain. You know this as you have said you have taken cycles before so im not trying to make you feel stupid or anythinig. I mean im sure the epistane can help with gyno while on cycle but i think ppl are misunderstanding it when they read about how it helps reduce gyno. Ive heard great things about epistane but to me it just looks like something that would help market the product. Dont get me wrong from what i hear its awesome. I will be runnin an epi cycle towards the end of this summer.