IGF-1 LR3

A modified analogue of insulin-like growth factor 1 designed to reduce binding-protein affinity, used in cell culture research.

What research shows

IGF-1 itself has real biology: infusion increased organ growth in animal models. What we could not verify is anything specific to the LR3 analogue sold online, which appears in reviews of the non-approved performance market rather than in trials. No human study of it was verified.

Evidence strength

Highest evidence grade among the graded claims: C. Grades reflect study strength, not benefit.

Safety context

See the safety section. Absence of a flag is not evidence of safety.

No endorsement

A grade reflects evidence strength, not a recommendation to use this compound; a strong grade can attach to a harmful effect.