Looking Into Insulin. Any Help?

hi ive been training for bout 5 years, on and off but in the last 2 years i have really taken it serious and quite obsesively, i was 152lb and now 190. ive done a few courses of ass, oral and prohormons, im currently 5’8,190lb, and eating 3600kal pday, ive been looking into insulin as ive heard many good things but aslo alot of worrying things too. can anyone help? any info would help.