System Entry • 4/5/2026
IGF-1 LR3: Insulin-Like Growth Factor Research in the Laboratory
Long R3 IGF-1 vs native IGF-1: binding proteins, half-life considerations, and why LR3 analogs appear in cell culture and muscle-related research models.
### IGF axis basics
Insulin-like growth factor 1 (IGF-1) mediates growth-hormone–related anabolic signaling. Native IGF-1 binds **IGFBPs** strongly, limiting free fraction and tissue availability in many assays.
### LR3 modification
IGF-1 LR3 includes an N-terminal extension and arginine substitution that reduces IGFBP affinity in common experimental designs, extending **functional half-life** in cell culture relative to native IGF-1—why many in vitro protocols reference LR3 analogs.
### Research applications (non-clinical)
Typical laboratory uses include **cell proliferation** assays, **myotube** models, and protein-synthesis readouts—always under institutional biosafety and ethics rules.
### RUO
Not for human use. For laboratory research only.
*IGF-1 LR3 is stocked for research customers requiring documented purity.*
