New — Free Peptide Starter Guide (2026): 13 chapters, 34 cited studies

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IGF-1 DES

Also known as: DES(1-3)IGF-1, Truncated IGF-1, Des-IGF-1

IGF-1 DES (also written DES(1-3)IGF-1) is a truncated form of IGF-1 missing the first three amino acids of the N-terminus. This structural change dramatically reduces its affinity for IGF binding proteins (IGFBPs), meaning a far greater fraction remains in its free, active form. IGF-1 DES is estimated to be 10x more potent than standard IGF-1 LR3 at the receptor level locally, making it particularly effective for site-specific muscle growth when injected intramuscularly.

Half-Life

~20–30 minutes (very short — designed for local action)

Route

IM, SubQ

Category

Anabolic & IGF

Studies

50 references

Key Benefits

  • Estimated 10x greater potency at the receptor vs IGF-1 LR3 locally
  • Minimal IGFBP binding — nearly all active upon injection
  • Highly localized muscle growth effect when injected intramuscularly
  • Activates satellite cells for muscle fiber hyperplasia potential
  • Synergistic with GH peptides in post-workout anabolic protocols
  • Shorter half-life reduces systemic exposure vs IGF-1 LR3
  • Useful for site-specific muscle development

Mechanism of Action

By lacking the N-terminal tripeptide Gly-Pro-Glu, IGF-1 DES has approximately 1000-fold lower affinity for IGF binding proteins compared to native IGF-1. Since IGFBPs sequester IGF-1 and reduce its biological activity, the greatly reduced IGFBP binding of IGF-1 DES means nearly all injected peptide is immediately available to bind IGF-1 receptors. It activates the same IRS-1/PI3K/Akt/mTOR pathway as native IGF-1, driving protein synthesis, satellite cell activation, and muscle hypertrophy. Its effects are highly localized to the injection site.

Dosing Protocols

Site-Specific Muscle Growth Protocol

Dose
20–50 mcg per injection site
Frequency
Once daily, post-workout
Timing
Immediately post-workout, intramuscular into target muscle
Cycle
4–8 week cycles

Research use only — not FDA approved. Always inject with food nearby due to hypoglycemia risk. Lower doses (20 mcg) recommended for beginners. Do not inject systemically at these doses.

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Side Effects

  • Hypoglycemia (most significant risk — especially post-workout)
  • Localized muscle swelling at injection site
  • Potential for jaw/organ growth (acromegalic effects) with prolonged high-dose use
  • Carpal tunnel syndrome with high doses
  • Theoretical cancer growth promotion

Contraindications

Not FDA approved. Absolute contraindication in active malignancy. Diabetics require careful blood glucose monitoring. Pregnancy contraindicated.

Storage

Lyophilized: store at -20°C. Reconstituted with acetic acid: refrigerate at 2–8°C, stable 2–3 weeks.

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    Increased supply of lysine, methionine, and histidine during heat stress in primiparous and multiparous dairy cows: Effects on clinical signs of heat stress, performance, and metabolism

    Ruiz-González A, Leung YH, Celemin A, Kenez A, Chouinard PY, Gervais R et al. · Journal of dairy science · 2026PubMed Verified

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    Novel insights into the effects of JMV2894, a growth hormone secretagogue, in Duchenne muscular dystrophy: A preclinical study in the D2-mdx mouse model

    Mantuano P, Boccanegra B, Marinelli M, Cristiano E, Lenti R, Tulimiero L et al. · Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie · 2025PubMed Verified

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    Loss of heterozygosity and absence of MAX immunostaining in a prolactinoma associated with multiple endocrine neoplasia type 5 (MEN5)

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    Serum IGF1 Is a Prognostic Marker for Resistance to Targeted Therapies and a Predictive Marker for Anti-IGF1 Receptor Therapy in Melanoma

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    Antagonistic pleiotropy: the example of cardiac insulin-like growth factor signaling, which is essential in youth but detrimental in age

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Medical disclaimer: This information is for educational purposes only and does not constitute medical advice. Many compounds listed are research chemicals not approved for human use. Always consult a qualified healthcare professional before starting any protocol.

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