Some people say they like vitex, or chyrsin as khadar said. Most of the OTC estrogen supps you find will not do much of anything and if your getting sides from AAS or worried about them then I would look for liquidex, arimadex, nolvadex, etc. If your just using an over the counter prohormone or something then maybe taking the herbal anti-e's could help a little(because then your dealing with a much weaker compound), but you shouldnt even need them.