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 Safety and Efficacy of Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance Sports Medicine Springer Nature Link An FDA Reversal on Peptides Could Open the Market to Unsafe Drugs ProPublica IGF 1 LR3: Nasal Spray vs. Subcutaneous Injection Comparison CJC 1295 Ipamorelin Dosage Protocol: The Complete Clinical Guide to Dosing, Cycling, and Injection Perfect B