I'm fortunate to have a brother sports med doc. He always tests me for Estroidals when doing Test levels. He avoids prescription anti estrogens because of their side effects such as blood clots in older athletes that have some plaque buildup (don't we all to some degree?). He advises his older athletes who are on HRT and are showing elevated estrogens to use over the counter Novadex XT....In my case I dropped from a 65 level to 45 and toatal Test rose from 1050 to 1200.