Why this peptide
Key highlights
1 mg lyophilized vialFreeze-dried peptide in a sterile, UV-resistant glass vial.
98.63% HPLC purityEach lot analyzed by an accredited US third-party lab via HPLC and mass spectrometry.
Cold-chain peptideRefrigerate after reconstitution. Diluent and lab supplies not included.
Research use onlySupplied exclusively for laboratory investigation and development. Technical data
Product specifications
IGF-1 LR3 (Long R3 IGF-1) — 1 mg lyophilized 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 analysis Sourcing & quality
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Quality control across the research-peptide industry is inconsistent, and many suppliers do not publish third-party testing for their products.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.
Third-party tested & certified
Verified by MZ Biolabs (Tucson, AZ), an accredited US laboratory, via HPLC and mass spectrometry, with batch-linked COAs.
Lyophilized & packaged in America
Freeze-dried into sterile, UV-resistant glass vials and packaged in the USA.
Tamper-evident packaging
Supports chain-of-custody, label transparency, and batch-linked traceability.
60-day money-back guarantee
Transparent business, standard payment methods, no misrepresentation. Research context
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.
Regulatory & compliance status
Important regulatory information
Not approved for human use
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.
WADA-prohibited
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).
Legal status for research
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.
Our position
Sports Technology Labs are chemical suppliers, not medical providers. We do not condone or encourage consumer use of research compounds. Citations
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.