For Laboratory Research Use Only · Not for Human or Veterinary Use · 21+
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IGF-1 LR3 vial

Best Peptides for Muscle Growth·Injection

IGF-1 LR3

Long Arg3 IGF-1 analog for direct local hypertrophy.

$99.99/ 1 mg vial
View IGF-1 LR3 lab results & testing

For Research Use Only

IGF-1 LR3 is sold strictly for in-vitro laboratory research. Not for human or veterinary use, diagnosis, treatment, cure, or prevention of any disease. Not FDA-approved as a therapeutic. Must be 21+ and a qualified researcher to purchase. See our Disclaimer and Research Use Agreement.

Purity
≥ 98.9% HPLC
Format
Injection
Half-life
20 hours
Dose
40–80 mcg daily
Mechanism
IGF-1 receptor agonist with reduced IGFBP binding

About IGF-1 LR3

IGF-1 LR3 is a 70-amino-acid modified IGF-1 analog with a 13-amino-acid N-terminal extension and arginine substitution at position 3. The modification extends half-life to 20 hours and produces the fastest local hypertrophy response of any growth peptide.

Reported benefits

  • Drives 1.9 kg local lean mass over 12 weeks
  • Extended 20-hour half-life through reduced IGFBP binding
  • Direct IGF-1 receptor activation, no GH conversion required

Research citations

  • Tomas et al. 1993 - Journal of Endocrinology
  • Bayol et al. 2005 - Growth Hormone & IGF Research

How IGF-1 LR3 fits the category

IGF-1 LR3 sits inside the Best Peptides for Muscle Growth category. For the full ranking and head-to-head comparisons, read Best Peptides for Muscle Growth.