IGF 1 The Definitive Guide IGF 1 vs. HGH Which is Better for Growth and Fat Loss? HRT Peptides & Muscle Gain a medical perspective., Peptide therapy is increasingly being discussed in the context of muscle recovery, lean mass development, and injury rehabilitation., When used Most people train harder. Smarter people optimize recovery. IGF 1 LR3 is a long acting growth factor analog that supports muscle recovery, lean mass preservation, cellular repair, and metabolic signaling when used under medical Recombinant Human LR3 IGF 1(E51R) Protein