IGF-1 LR3 (Insulin-like Growth Factor-1 Long Arginine 3) is a synthetic analogue of human IGF-1 with an arginine substitution at position 3 and a 13-amino acid extension peptide. It has attracted growing interest in research focused on muscle growth, tissue repair, and metabolic health.
Studies have shown that IGF-1 LR3 exhibits significantly reduced binding to IGF-binding proteins (IGFBPs), resulting in a longer half-life and enhanced bioavailability compared to native IGF-1. It activates the IGF-1 receptor, promoting protein synthesis, cell proliferation, and glucose uptake. It may also play a role in muscle wasting prevention, neuroprotection, wound healing, and recovery from injury.
IGF-1 receptor activation and anabolic signaling
Muscle hypertrophy and protein synthesis promotion
Reduced IGFBP binding and prolonged bioactivity
Glucose metabolism and insulin sensitization
Neuroprotection and tissue regeneration research