Someone already asked a question very similar to this. With that said, don't stack it with Novedex xt. Use the Novedex after your Havoc cycle because Novedex is a PCT product and Havoc is already a built in anit-estrogen. As far as stacking it with Tren, well that would mean you are taking two methelated steroids together. I don't think it will kill you but just keep your liver health in mind. Good luck.