What is the best AI to run on cycle while bulking to prevent gyno but maximize gains? I know it is mandatory to run one while cutting but I am bulking right nwo running 750 mg of Sustanon and 400 mg of Deca weekly. I have read that extrogen is needed while on cycle and that AI's will have a drastic roll in reducing what gains you may have made while on cycle. I was thinking of Liquidex or Liquid Aromasin as Nolvadex seems to only compete for the receptors, not lower high estrogen that has already formed.