Estro Xtreme is 4-hydroxyandrostendione, Androstentrione (Formastane clone). Mass Xtreme is 17 a Methyl-etioallocholan-2-ene-17b-ol (Phera clone, I think). Yea I think im just goin to do 6 weeks. Before I start the cycle I got some blood results done, just for check up, and my liver enzyme was a little high so Im holding the Mass for another time and just running the Tren. I also got all support supps. Thanks for you input.