40 YEARS OF IGF1: Insulin like growth factors: actions on the skeleton in: Journal of Molecular Endocrinology Volume 61 Issue 1 (2018) Explanation, Benefits, and Dosing for IGF LR3 Wittmer Rejuvenation Clinic IGF 1 LR3 (Insulin like Growth Factor 1 Long R3) is often called the "Holy Grail" of muscle building peptides because of its potent anabolic effects. In a Med Spa context, it is typically sought out IGF 1 LR3 EQUINE MEDCARE IGF 1 LR3 in Aesthetic and Anti Aging Medicine: Benefits and Risks Hubmed Pediatric Implications of Normal Insulin GH IGF Axis Physiology Endotext NCBI Bookshelf