Does IGF-1 LR3 work?
No meaningful testing published in people; it is a lab reagent.
For the muscle-growth use IGF-1 LR3 is sold for, no human study exists. The cited material is a review of IGF-1 receptor signalling, a 2019 animal or cell study and a 2026 review of IGF-1 analogs; the compound's documented use is as a growth supplement in laboratory cell culture. 123
No human study of IGF-1 LR3 has been published. Animal work has used it in farming and physiology experiments because it is stable. But no trial has measured muscle, fat or performance after IGF-1 LR3 in any species, which is the purpose it is sold for. 23
Evidence checklist
- Randomised controlled trial No human study
- Human study over 100 people No human data
- More than one research group Little beyond a few reviews
- Clinical outcomes, not surrogate markers No human outcomes
- Human safety data beyond case reports No human safety data
More on IGF-1 LR3
Citations
- Hakuno and Takahashi 2018, Journal of Molecular Endocrinology: IGF1 receptor signaling pathways pubmed.ncbi.nlm.nih.gov
- Scientific Reports 2019: experimental study using IGF-1 LR3 doi.org
- Frontiers in Endocrinology 2026: review covering IGF-1 analogs doi.org
Reference information only, not medical advice. Drawn from the IGF-1 LR3 article, fact-checked against the cited sources. No dosing anywhere on this site.