IGF-1 LR3 frequently asked questions

IGF-1 LR3 is a 83-residue IGF-1 analog designed for activity at the IGF-1 receptor (IGF1R). IGF-1 Research supplies it as a lyophilized powder in 1 mg vials, with an independent certificate of analysis for every lot.

IGF-1 LR3 research material is IGF-1 LR3 supplied for laboratory research, sold by lot, with each lot's identity, purity and net content documented by an independent laboratory in a published certificate of analysis.

The molecular formula is C400H619N111O115S9 and the average molecular weight is 9111.55 g/mol. The peptide has 83 residues.

Store sealed, dry and protected from light at the temperature stated on the vial label. Allow a cold vial to reach room temperature before opening.

No. IGF-1 LR3 is an 83-residue analog of the 70-residue IGF-1, with an N-terminal extension and arginine at IGF-1 position 3.

It is used in small amounts in cell-culture research. The current lot measured 1.04 mg in the tested 1 mg vial.

IGF-1 LR3 is analyzed with complementary methods: HPLC-UV for purity, HPLC-RTM for identity, a quantitative measurement for net content, and, where listed, LAL endotoxin and PCR microbial testing. Results are published per lot at igf1.bio/coa/.

Every lot is tested by ILS Laboratories, an independent third-party analytical laboratory. IGF-1 Research does not test its own material for published certificates.

Current lots report HPLC-UV purity 99.69%, against a stated release specification of ≥95%. The most recent result is 99.69% for lot KB-17790.

By HPLC retention-time comparison with a reference standard (HPLC-RTM), performed by ILS Laboratories on every lot. The laboratory runs the sample and a reference standard of the named compound under the same HPLC conditions; identity is confirmed when the main peak elutes at the reference standard’s retention time.

Endotoxin and microbial testing are reported per lot. Every lot page in the COA archive states whether those tests were performed.

HPLC (high-performance liquid chromatography) separates a sample's components so each appears as a peak. The purity percentage is the main peak's share of all UV-detected peak area. It does not confirm identity (the separate HPLC-RTM test does) or measure the amount of peptide in the vial (net content does).

A IGF-1 LR3 certificate of analysis is the testing laboratory's report for one lot: the lot number, test dates, methods and results for purity, identity and net content. IGF-1 Research publishes every lot's COA as a readable page at igf1.bio/coa/.

Find the lot number printed on your vial label and enter it at igf1.bio/verify/, or open that lot in the COA archive at igf1.bio/coa/.

Go to portal.ils-lab.com (or scan the QR code on the certificate) and enter the lot's verification access code, listed on its lot page, to view the laboratory's own copy of the certificate.

Net content is the laboratory's measurement of peptide in the tested vial. Current lots measured 1.04 mg in a 1 mg vial.

Current IGF-1 LR3 research material availability is provided through Klow.bio, the purchasing platform operated by Klow Labs: https://klow.bio/product/igf-1-lr3/ Lot records, testing information and certificates of analysis are published on igf1.bio so they can be reviewed before purchasing.

Yes. Purchasing information and current availability for IGF-1 LR3 research material are provided through Klow.bio: https://klow.bio/product/igf-1-lr3/

Yes. Every lot is tested by ILS Laboratories, an independent laboratory, for HPLC-UV purity, HPLC-RTM identity and net content. The stated release specification is ≥95% HPLC-UV purity with identity confirmed by HPLC retention-time match against a reference standard. The current lot, KB-17790, reported 99.69% purity.

Enter the lot number from your vial label at igf1.bio/verify/ to see that lot's results. To confirm with the laboratory directly: Go to portal.ils-lab.com (or scan the QR code on the certificate) and enter the lot's verification access code, listed on its lot page, to view the laboratory's own copy of the certificate.

The current price is $69.99, with bundle pricing (2 vials save 5%; 3 or more vials save 10%). Current pricing is always listed on Klow.bio.

Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout.

IGF-1 Research covers IGF-1 LR3, the 83-residue IGF-1 analog, and publishes the independent laboratory result for every lot sold through Klow.bio. IGF-1 Research is operated by Klow Labs LLC in Chicago, IL. Purchasing is handled through Klow.bio.

IGF-1 Research is operated by Klow Labs LLC, 3838 N Ravenswood Ave PMB 2027, Chicago, IL 60613. Klow Labs LLC also operates klow.bio.

No. IGF-1 Research supplies research material and publishes analytical documentation. It does not provide medical advice, dosing, administration guidance or protocols.

Email contact@klow.bio, call (708) 262-7687, or use the contact form at igf1.bio/contact/.