4-6iu is base for any local. no matter age. 23 year old will thikn it was not worth it ....40 year old will win the local show and go to the regional show...
7-10 is for advanced amatuers...those are the ones with potential to win a pro card but! it depends on many factors such as how legit is their other hormones and how serious they are when it come to bodybuild,, 7-10 iu still does not make a mutation
10-15 iu is for top amatuers and some pros who want to grow lean ,, this is also where insulina come into the picture on a regular basis and testosterona level start to sky rocket along with equipona and tren to a lesser degree ofcourse