IGF-1 LR3

Mechanism of Action

IGF-1 LR3 is a modified version of Insulin-Like Growth Factor 1, engineered with an arginine substitution at position 3 and a 13-amino acid N-terminal extension. These modifications reduce binding to IGF-binding proteins (IGFBPs), resulting in a half-life roughly 3x longer than native IGF-1. It promotes cell proliferation and inhibits apoptosis through the PI3K/Akt and MAPK/ERK signaling pathways. In muscle tissue, it stimulates satellite cell activation — the precursor cells responsible for muscle fiber repair and hypertrophy.

What Researchers Report

• check_circle Enhanced satellite cell proliferation in skeletal muscle models.
• check_circle Increased protein synthesis rates by 30-40% in cell culture.
• check_circle Reduced muscle wasting markers in catabolic condition models.

Researched For

Muscle growth, recovery from training-induced damage, anti-catabolic protection, and cell proliferation research. Favored by serious researchers looking at hypertrophy pathways and post-exercise recovery optimization.