Testosterone, GH, IGF 1, Estrogen in Men Ultimate Guide Switched things up and have been using my IGF 1 LR3 30 mins pre workout and have been noticing longer lasting pumps and more vascularity so far! 2 more weeks until I cycle Recombinant Human LR3 IGF I IGF 1 GMP Protein, CF 8335D GMP: R&D Systems Growth Hormone and Insulin like Growth Factor I: Novel Insights into the Male Reproductive Health IntechOpen IGF 1, the Cross Road of the Nutritional, Inflammatory and Hormonal Pathways to Frailty IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society