Great read!!! I wish I had known more about progesterone and tren before I started taking it. I staked deca/tren this past offseason and ran anti estrogens (novaldex). I started to get gyno w no lump didnt get it, thats when I brought on the novaldex which did nothing bc it doesnt block progesterone. duH! Im not sensitive to estrogen, but very sensitive to estrogen combinded with high levels of progesterone. Im running letro now and its brought down the gyno huge. Plan on gyno surgery sometime soon, be careful what u run. Some people will get gyno regardless, its genetic.