The reason athletes have become interested in peptides is that they serve as signaling molecules. Instead of taking, say, human growth hormone, you can take a peptide that tells your body to Effects of IGFBP 2 on insulin and IGF 1 stimulated glucose uptake in Download Scientific Diagram An FDA Reversal on Peptides Could Open the Market to Unsafe Drugs ProPublica Safety and Efficacy of Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance Sports Medicine Springer Nature Link An insight into the multifunctional role of ghrelin and structure activity relationship studies of ghrelin receptor ligands with clinical trials ScienceDirect IGF 1 LR3: Nasal Spray vs. Subcutaneous Injection Comparison