IGF-1 LR3

IGF-1 LR3 (Long R3 Insulin-like Growth Factor-1) is an 83-amino acid analog of human IGF-1 with enhanced potency and duration. The substitution of arginine at position 3 and the 13-amino acid N-terminal extension reduce binding to IGF-binding proteins, dramatically increasing its bioavailability and half-life from 20 minutes to 20-30 hours.

What makes IGF-1 LR3 unique is its ability to promote muscle hyperplasia - the creation of entirely new muscle cells - rather than just hypertrophy (enlargement of existing cells). This means it can produce permanent increases in muscle cell number, a fundamentally different mechanism from any other performance compound.

IGF-1 LR3 also plays critical roles in protein synthesis, glucose uptake, and cell differentiation. It activates the PI3K/Akt pathway, one of the most important signaling cascades for cell survival and growth.