Overview
IGF-1 LR3 is a chemically modified, longer-acting version of insulin-like growth factor 1 (IGF-1), used as a cell-culture research reagent and misused for muscle growth.
How It's Thought to Work
IGF-1 drives cell growth and proliferation; the LR3 modification extends its half-life and reduces binding to carrier proteins, increasing activity.
What the Research Says
Used legitimately as a laboratory reagent; there is no approved human therapeutic use of IGF-1 LR3, and human safety data for that use is lacking.
Regulatory & Legal Status
Not FDA-approved for human use. A research reagent; prohibited in sport by WADA.
Safety Considerations
Potentially serious risks (e.g., hypoglycemia, effects on growth of tissues). No approved human use. Consult a qualified clinician.