I search on this forum, and got different answers some say 3-4 days and I was wondering how people do 5-6 days on and off cycles? but after mixing the serostim hgh 6mg how many day do I have to kill it. I took 4iu yesterday and just mixed it yesterday but if it's 3 day's that means I would have to take 6ius to equal the 18iu for the bottle. Any help thanks,