Nolvadex is a strong anti-estrogen..You will take 1-2 week 40 mg every day 1-2 week 50 mg mesterelone(proviron)2-4 week 20 mg nolvadex 2-4 week 25 mg mesterelone(proviron)for pct..Proviron is a good pct product..It s make testosterone booster,increase lutein hormone and anti estrogenic effects in your body