Usually you have to run Growth for a long time to see its benefits. I ran 4 IU's a day for 4 or 5 months I used it during a huge blast cycle, and then kept running it during my cruise until I ran out. I will run it again during my next blast. I wish I had the money to run it forever like TRT but for now I just run it during my blasts and maybe a little bit after the blast ends if I have any left over or whatever. To my knowledge, you should be good to run it at 51. and like supps said, it will make cancer cells grow faster. it creates satellite cells. these satellite cells are newer, younger, healthier. this is why they say its like the fountain of youth. also, i wouldnt take Growth without test, but I know youre running test so youre good.