I think there is some misunderstanding about this. Unless someone can show me otherwise I am of the conclusion that IGF will in no way cause cancer at all. What IGF could do, like any growth factor, is accelerate the growth of any malignant carcinoma.
In other words if you were to already have cancer, and it is already spreading, it could spread faster. That is a lot different than causing cancer.
IGF-1Lr3 Dosing is between 50-150mcg/day.