Tamoxifen (Nolvadex):
Reputation: Most popular SERM for PCT
Pros: Cheap. Effective for gyno prevention.
Cons: Heptatoxicity. Studies have shown it to lower IGF levels (I don't feel like citing, but it's about 20% decrease...IMO no biggie).
Popular Dosage (for a 4-week cycle): 40/40/20/20
Note: Tamoxifen Citrate is less potent, and should be dosed at an extra 30%.