Are IGF-1 lr3 and Mechano Growth Factor liver toxic? I know the IGF-1 is produced in the liver. I had my labs done on just the 200mcg of the peg mgf and my test levels weree 899 which is super high and my liver enzymes were slightly out of range but nothing to be alarmed with. I have a buddy who was running pct with 40mgs of nolvadex which i know is hepatoxic,and he was also running 100mg IGF-1 LR3 with 200mcg PEG MGF. Anyways his liver values were 6 times higher than normal so he aborted the cycle and is running bile acid at 1 gram a day.It has been almost 3 weeks and he is going back to get them tested so i will keep you guys posted,but ne input and personal experiences would be great. I just wanna know what support supps might be necessary and how hepatoxic these substances are.