IGF-1 LR3 (Insulin-Like Growth Factor-1 Long R3) is a synthetic peptide studied in human research for its role in cellular growth and metabolic signaling. Clinical studies have explored its potential to support muscle cell growth, tissue repair, and overall anabolic processes under controlled conditions. Research has also investigated IGF-1 LR3’s effects on protein synthesis, glucose metabolism, and endocrine pathways. Human studies suggest it can influence growth factor signaling and cellular function while providing a valuable tool for studying metabolism and tissue development. Across published research, IGF-1 LR3 has been widely used to investigate mechanisms of growth, repair, and cellular regulation. Research Use Only. Not For Human or Veterinary Use.