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Clin Chim Acta (2000) 300:7117

Unlike standard IGF1, the LR3 version has two key modifications that enhance its potency and duration: The Long designation refers to an additional 13 amino acids, increasing its molecular stability The Arg3 substitution reduces its binding to IGF-binding proteins (IGFBPs), extending half-life from minutes to ~2030 hours These changes allow IGF1 LR3 to remain active in the bloodstream much longer than endogenous IGF1, resulting in greater anabolic signaling and sustained muscle growth potential

SmithAMKingJJWestPRLudwigMADonleyELRRBurrierREet al

This process appears to be triggered by age-dependent changes in red cell surface proteins, which lead to their recognition and removal by phagocytes