Igf-1 LR3 version does not produce any site growth. Its half-life is to long over 10hours I beleive the half-life is. If you are looking for site growth the only thing I can think of is rIgf-1 which may cause site growth because its half-life is around 30minutes. Which means most of the igf-1 will stay in the muscle you just injected it into. Case Closed :7up: