Growth Factor Analog Peptide

IGF-1 LR3

Long R3 IGF-1

LR3-IGF-1

Long Arginine 3-IGF-1

An 83-amino acid synthetic analog of human insulin-like growth factor 1 with reduced binding protein affinity and extended half-life, studied for anabolic and tissue growth effects in preclinical research. Premium Research Peptide.

Certificate of Analysis

Third Party Tested by Freedom Diagnostics

99.61%
Purity
Variant
IGF-1LR3 1mg
Lot #
Clear Cap/Black Cap
Labeled
1mg
Actual
1.09 mg
Tested
Apr 14, 2026

Compound Information

Technical specifications

🔬 Molecular Profile

What Is IGF-1 LR3?

Type
Synthetic IGF-1 analog
CAS Number
143045-27-6
Molecular Weight
9,117.60 g/mol
Amino Acids
83
Formula
C400H625N111O115S9
Sequence
MFPAMPLSSL FVNGPRTLCG...
🧬 Structural Modifications

How It Differs from Native IGF-1

N-terminal extension
+13 amino acids (MFPAMPLLSLFVN)
Position 3 substitution
Glu → Arg
Total length
83 vs 70 amino acids
IGFBP affinity
Dramatically reduced
IGF-1R affinity
Retained

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