Key highlights
Product specifications
| Compound Class | Synthetic Polypeptide · Analog of insulin-like growth factor-1 (IGF-1) |
|---|---|
| Form | Lyophilized powder in sterile glass vial |
| Quantity | 1 mg per vial |
| CAS Number | 946870-92-4 |
| Chemical Formula | C400H625N111O115S9 |
| Molar Mass | 9117.60 g/mol |
| Half-Life | ~20–30 hours |
| Residues | 83-amino-acid polypeptide (native IGF-1 with R3 substitution and 13-residue N-terminal extension) |
| Amino Acid Sequence | MFPAMPLSSL FVNGPRTLCG AELVDALQFV CGDRGFYFNK PTGYGSSSRR APQTGIVDEC CFRSCDLRRL EMYCAPLKPA KSA |
| Synonyms | IGF-1 LR3, Long R3 IGF-1, Long R3-IGF-1, IGF-1 Long R3 |
| Verified Purity | Batch-tested to 98.63% (HPLC) |
For laboratory research use only. Not for human or animal consumption.
View certificates of analysisIndependently verified
This peptide is analyzed by an accredited US third-party laboratory before it ships.
Identity and purity confirmed by MZ Biolabs (Tucson, AZ), a US DEA-licensed analytical facility, via HPLC purity analysis and mass-spectrometry identity confirmation under GLP standards.
Our third-party certificates of analysis are published on our website — no login required.
IGF-1 LR398.63% pure
Storage & handling
Peptides are photo- and temperature-sensitive; handle per standard laboratory practice.
- Lyophilized storage: Keep the sealed vial cool, dry, and protected from light. For longer-term storage, freezing is standard practice for lyophilized peptides.
- After reconstitution: Refrigerate (approximately 2–8 °C) and follow your institution’s SOPs for aliquoting, handling, and disposal. Avoid repeated freeze–thaw cycles.
- Diluent not included: A suitable laboratory diluent and reconstitution supplies are not provided with this product.
- UV-resistant glass vial to help protect photo-labile peptides during storage.
- Tamper-evident seal to support chain-of-custody and inventory controls.
Why source IGF-1 LR3 from Sports Technology Labs
Quality control across the research-peptide industry is inconsistent, and many suppliers do not publish third-party testing for their products. Independent verification of identity and purity is essential for reproducible research.
Verified by MZ Biolabs (Tucson, AZ), an accredited US laboratory, via HPLC and mass spectrometry, with batch-linked COAs.
Freeze-dried into sterile, UV-resistant glass vials and packaged in the USA.
Supports chain-of-custody, label transparency, and batch-linked traceability.
Transparent business, standard payment methods, no misrepresentation.
What is IGF-1 LR3?
IGF-1 LR3 (Long R3 IGF-1) is a synthetic analog of insulin-like growth factor-1 (IGF-1). It differs structurally from native IGF-1 in two ways: an arginine substitution for glutamic acid at position 3 (the “R3”), and an additional 13-amino-acid extension at the N-terminus (the “Long”).
These structural modifications reduce the molecule’s binding to IGF-binding proteins (IGFBPs) and extend its half-life relative to native IGF-1. Mechanistically, it binds the IGF-1 receptor (IGF-1R). It is used as a research chemical to investigate IGF-1 receptor signaling in experimental models.
IGF-1 LR3 is an experimental research chemical, supplied strictly for laboratory research. Sports Technology Labs makes no claims regarding its effects, and nothing in this listing should be interpreted as describing outcomes in humans or animals.
Important regulatory information
IGF-1 LR3 is an investigational research peptide. It is not approved by the FDA and is not a drug, food, dietary supplement, or cosmetic. Marketing it for human use is unlawful.
Insulin-like growth factor-1 (IGF-1) and its analogues are prohibited by the World Anti-Doping Agency at all times under S2 (Peptide Hormones, Growth Factors, Related Substances and Mimetics) (ref. 3).
In the United States, IGF-1 LR3 is not a controlled substance and may be legally purchased and possessed for laboratory research use. Other jurisdictions may regulate it differently.
Sports Technology Labs are chemical suppliers, not medical providers. We do not condone or encourage consumer use of research compounds.
Scientific references
- Bailes J, Soloviev M. Insulin-like growth factor-1 (IGF-1) and its monitoring in medical diagnostics and in sports. Biomolecules. 2021;11(2):217.
- National Center for Biotechnology Information. PubChem Compound Summary for IGF-1 LR3 / Long R3 IGF-1 (CAS 946870-92-4): sequence, molecular formula, and molecular weight. PubChem, National Library of Medicine.
- WADA Prohibited List (2025), Section S2: Peptide Hormones, Growth Factors, Related Substances and Mimetics (Insulin-like Growth Factor-1 and its analogues). WADA.org.
Research use only. All products on this website are intended exclusively for laboratory research and development. They are not for human or animal consumption. These statements have not been evaluated by the U.S. Food and Drug Administration, and these products are not intended to diagnose, treat, cure, or prevent any disease.
