I just started my first cycle last Friday of Sustanon. Dosing 250mg Friday and tues. Guy I got it from said I don't need an anti estrogen since Im only doing 500mg per wk, but says he can get Arimadex if I need it. He said he's never had any sides personally. Any suggestions? Also, should I do my second shot today, or wait til Friday and then start twice per week? Would this cause my body to be more susceptible to higher estrogen levels?