Some people I know say they use proviron during cycle to keep and maintain testosterone production look hard and dry during the cycle. I know that does not help to maintain natty production, only hcg helps not shut down. Proviron can be replace an AI? Lowers levels e2? Actually reduces water retention duramte cycle? I know other people who use proviron during pct for libido. When use proviron? What is it and why is it used?