FAQ for Researchers
IGF-1 LR3 FAQ: Reconstitution, Storage, Purity & Sourcing
3 min read•Published 2025-01-07•Quality Peptide USA Research
IGF-1 LR3 (Long Arginine 3 IGF-1) is a recombinant 83-amino-acid analog of human insulin-like growth factor 1. An N-terminal extension and an arginine substitution at position 3 reduce binding to IGF-binding proteins, extending the molecule's research half-life relative to native IGF-1.. This guide covers faq for researchers for IGF-1 LR3 — written for laboratory researchers sourcing US-synthesized peptides from Quality Peptide USA.
Is IGF-1 LR3 research-grade?
Yes. Every batch of IGF-1 LR3 sold by Quality Peptide USA is released to a ≥ 99% HPLC purity specification, with mass-spec identity confirmation and LAL endotoxin testing on every lot. The certificate of analysis is published on the product page.
How should IGF-1 LR3 be reconstituted?
Reconstitute IGF-1 LR3 with bacteriostatic water (0.9% benzyl alcohol). Inject the water down the inside wall of the vial — do not inject directly onto the lyophilized cake. Swirl gently until fully dissolved. Refrigerate at 2–8°C after reconstitution.
What is the reported half-life?
≈ 20–30 hours (research models) Half-life figures from in-vitro models are not directly transferable to ex-vivo or in-vivo systems.
Where is IGF-1 LR3 synthesized?
IGF-1 LR3 is synthesized in the United States and ships from a US facility. No overseas drop-shipping, no customs delays, full domestic cold chain.
What testing is performed on each batch?
RP-HPLC purity (≥ 99% spec), ESI / MALDI-TOF mass spectrometry, Karl Fischer water content, LAL endotoxin screen, and bioburden. All results are published on the per-batch certificate of analysis.
Can IGF-1 LR3 be stacked with other peptides?
Many research protocols pair IGF-1 LR3 with complementary peptides — the Glow stack for dermal models, the Wolverine stack for tissue repair, or GHRH/GHRP secretagogue blends for somatotropic studies. Review the published literature for your specific endpoint before designing a stacked protocol.
Research Use Only
All content is for laboratory and in-vitro research contexts only. Not intended to diagnose, treat, or prevent any condition. Not for human or veterinary consumption.
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