Increase Free Testosterone, Block Estrogen, Block DHT, Increase T Precursor DHEA. Reduce Cortisol. Natural , Vegan, 3rd Party Tested, Gluten Free, Non-GMO. Cell Block 80 contains Op T-max with DM33 free your testosterone. Lock up estrogen & DHT. Cell Block 80 was formulated to address all 5 major biochemical processes that drive Testosterone (T) to reach the target muscle growth. Introducing Op T-Max with DM33 (opuntia ficus-indica Flower Extract 9:1) Based on preliminary laboratory research, Opuntia flower extract (1mg/ml concentration) inhibited 80% of the activity of 5alpha-reductase in human prostate tissue homogenate and inhibited 80% of aromatase activity in human placenta tissue homogenate. And that's why we call it Cell Block 80.