IGF-DES (IGF-1 DES[1-3])Growth Factor Analog PeptideSafety Rating 4/10

TypeTruncated IGF-1 analog (residues 4–70)
CAS112603-35-3
MW≈7,371 g/mol
AAs67
Primary research areaMuscle / IGF research

Research-literature reference data, NOT patient instructions. Not for human use. Consult a licensed clinician for any human application.

Research dose rangeLimited clinical data; research protocols 20–100 mcg/injectionsource ↗
AdministrationSubcutaneous or intramuscular (site-specific)
Half-life~20–30 minutes
Safety4/10 · Not FDA-approved
NCAA D1Banned

Price Comparison

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Swiss ChemsBest $/mgCOA ✓ · 3P$55.95$55.95Apr 17, 2026Buy →
$25 off $100+·auto
PureRawzCOA ✓ · 3P$109.93$109.93May 14, 2026Buy →
Behemoth LabzCOA ✓ · 3P$196.05$196.05May 14, 2026Buy →

Overview

About IGF-DES

Mechanism of action

Truncated IGF-1 lacking the first 3 amino acids; does NOT bind IGF binding proteins (IGFBPs) — results in 10x greater potency at the receptor vs. standard IGF-1 LR3; direct, unhindered IGF-1 receptor activation at injection site.

Safety profile

Hypoglycemia risk, localized muscle swelling, potential for disproportionate site growth, insulin resistance, water retention. Similar risk profile to IGF-1 LR3. · More potent than IGF-1; hypoglycemia proven; tumor promotion concern; mechanistic risk basis

Storage

Stability & handling

❄️Lyophilized (powder)−20°Clong-term stable
💉Reconstituted2–8°Cwithin 14–30 days
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Research

Studies & key findings

  • Des(1-3)IGF-I lacks the N-terminal Gly-Pro-Glu tripeptide and has been isolated from bovine colostrum, human brain tissue, and porcine uterus as a natural post-translational processing product; it demonstrates approximately 10-fold greater cellular potency than full-length IGF-I primarily because it binds negligibly to IGF-binding proteins (IGFBPs), leaving more free peptide available at the receptor.
  • A 1989 Biochemical Journal study established the core mechanism: IGFBP preparations that potently inhibited IGF-1 and IGF-2 bioactivity had no inhibitory effect on des-(1-3)-IGF-I, directly demonstrating that biological potency inversely correlates with IGFBP binding affinity.

6 peer-reviewed sources cited — clinical, preclinical, and regulatory.

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