What Is IGF-1 LR3?
IGF-1 LR3 is a long-acting analogue of insulin-like growth factor-1 designed for research into muscle growth, tissue repair, and cellular regeneration. Compared with native IGF-1, it has reduced binding to IGF-binding proteins and a longer duration of activity.
How It Works
It binds to IGF-1 receptors, activating signaling pathways involved in protein synthesis, satellite cell activation, glucose uptake, and tissue repair. Researchers investigate its role as a downstream mediator of growth hormone effects.
Potential Benefits Being Studied
Lean mass, recovery, connective tissue repair, muscle wasting disorders, orthopedic healing, and metabolic research.
Typical Research Dosing
Investigational protocols vary; no universally accepted dosing exists outside research.
Administration
Most research uses subcutaneous injection, though some protocols investigate intramuscular administration.
Possible Side Effects
Hypoglycemia, edema, headache, injection-site irritation, tingling, and unknown long-term risks.
Bottom Line
IGF-1 LR3 remains an investigational compound requiring additional high-quality human research.