LONG R IGF I LONG R IGF I QK041 Recombinant human bovine porcine IGF 1 LR3 protein IGF 1 LR3 The Muscle Building Peptide Everyone's Talking About IGF 1 LR3 is one of the most powerful performance peptides used for muscle growth, recovery, and fat loss. It's a modified version Endocannabinoids modulate human bloodbrain barrier permeability in vitro Hind 2015 British Journal of Pharmacology Wiley Online Library IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society