to be honest i dont remember completely, I think it had something to do with use over extended periods of time. When using for pct I would assume its used for peroids of less then 4 weeks.
I would definately do a lot more research before messing with it.
I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.