IGF-1 LR3 1mg

What is IGF-1 LR3?

IGF-1 LR3 (Long R3 IGF-1) is a recombinant analogue of Insulin-like Growth Factor-1, supplied as a research-grade lyophilized peptide in a 1mg vial for laboratory research use only (RUO). It is engineered with an arginine substitution at position 3 and a 13-amino-acid extension on the N-terminus — modifications that, in the research literature, are associated with a longer half-life and reduced binding to IGF binding proteins compared with native IGF-1.

How IGF-1 LR3 works

Native IGF-1 is a growth factor studied for its role in cellular growth and proliferation signalling. The LR3 modifications are studied for keeping the molecule active in circulation longer by lowering its affinity for the binding proteins that would otherwise sequester it. This extended-activity profile is why LR3 is the analogue most commonly used in growth-factor research rather than native IGF-1. All descriptions reflect published research and are provided for informational purposes only.

Product details and specifications

• Compound: IGF-1 LR3 (Long R3 Insulin-like Growth Factor-1), recombinant analogue
• Strength: 1mg per vial
• Form: Research-grade lyophilized powder for reconstitution
• Classification: Research chemical, research use only (RUO), not for human or veterinary use

Reconstitution and storage

Lyophilized IGF-1 LR3 is reconstituted in a laboratory setting; bacteriostatic water is commonly used, though some research workflows use a slightly acidic solution to aid solubility. Store the sealed, unreconstituted vial refrigerated and protected from light; once reconstituted, keep it refrigerated and use within research-standard timeframes. Do not freeze after reconstitution. Handling should follow standard laboratory practice.

Handling notes for research

IGF-1 LR3 is a peptide sensitive to repeated temperature change and agitation, so researchers typically reconstitute only what a given experiment requires and keep the stock vial cold. Accurate measurement matters at the 1mg scale, where small handling errors have an outsized effect on concentration — another reason verified purity is important.

Where to buy IGF-1 LR3 in the USA

You can buy IGF-1 LR3 1mg online directly from KGEAR U.S with fast US domestic shipping and discreet packaging — no customs, no border risk. We list IGF-1 LR3 for sale at a competitive price for research-grade material, and checkout is quick with crypto. New to paying with Bitcoin? Follow our how to buy Bitcoin (BTC) guide. To order, add the vial to your cart and complete checkout; orders ship domestically within the United States.

Related research peptides

Researchers who work with IGF-1 LR3 often also stock the BPC-157 / TB-500 blend, Retatrutide, and Tirzepatide. Browse the full research peptides catalog for the complete range.

Frequently asked questions

Can I buy IGF-1 LR3 online in the USA?
Yes. KGEAR U.S offers IGF-1 LR3 1mg for sale with US domestic shipping and crypto checkout, supplied for research use only.

What is the difference between IGF-1 LR3 and native IGF-1?
LR3 carries an arginine substitution and an N-terminal extension that, in research, are associated with a longer active half-life and reduced binding-protein affinity than native IGF-1.

What does RUO mean?
“Research use only.” IGF-1 LR3 is a research chemical and is not approved or intended for human or veterinary use.

How is it reconstituted?
In a laboratory setting, then stored refrigerated. Do not freeze the reconstituted solution.

Disclaimer: IGF-1 LR3 is sold strictly as a research chemical for laboratory and research use only (RUO). It is not a drug, supplement, or medical product and is not intended to diagnose, treat, cure, or prevent any disease, nor for human or veterinary consumption. All information above reflects published research and is provided for educational purposes only.