Anabolic steroids differ in their characteristics, which means there are steroids that are only suitable for specific uses. For instance, Trenbolone is not recommended for bulking but it is an outstanding fat burner. This makes it perfect for a lean mass cycle or a cutting cycle. Always take the side effects of a particular compound into consideration whenever you plan a stack. Do not combine anabolic steroids that show similar side effects. For example, never combine Anapolon and Dianabol because they are already quite toxic and if you combine them, the toxicity will increase exponentially and cause serious damage to your body.
This post has lots of users reporting that running an AI on cycle kills gains. On page 6 of that same post there is a guy talking about him and his buddy running the same gear, eating the same food, he ran an AI, his buddy didn’t, and his buddy had massive gains, while his were mediocre. This post from a company that does blood tests has multiple studies showing that too LOW E meant higher body fat and decreased sexual function . :-O And this study from Renal & Urology News talks about how high estradiol BOOSTS libido in men.