Nolvadex is a real good Serm. I use it at the start of all Prop cycles and throughout. It helps regulate the uptake of free estrogen in that the receptors are blocked and can't receive the circulating estrogen. The best bet, as MisterB mentioned, is to run Aromasin. It stops the body from producing excess estrogen, used in conjuction with Nolva, it's a 1-2 punch in controlling serious gyno issues. If you are not prone to bad gyno, then you probably don't need to run both Aroma and Nolva at the same time, especially with Mast in your cycle. Mast doesn't aromatize.....so, it helps keeps the estrogen production down.
I run Aromasin at 25mg Ed (depending on how bad my symptoms are, and how much gear I'm running), and Nolva at 40-60mg Ed. These numbers are really high for dosages, but I am EXTREMELY sensitive to gyno and produce high E2 numbers quite easily. Normally you could run Aroma at 12.5 eod, and Nolva at 20-40mg Ed. Start there and see how your body responds.
