ive been training on and off for roughly 4 or 5 years...im 21 now...most recently this past year i have completely dedicated myself to training and dieting while supplimenting with protein powders, creatines and l-glutamine...and have on occasion tried an andro or test support formula...in the past year my gains have been huge but i have seen a possible slowing of growth or decline in speed of growth...and more recently have been considering my first cycle and researching it fully...now with this in mind i know my genetics are good and have been told so by quite a few ppl...with this in mind...how can i tell if i can when i have reached my genetic potential or maxd my growth without the use of AS?