IGF-1 LR3 Research Information
Long-Arginine Insulin-Like Growth Factor-1
For Muscle Growth & Regenerative Research
️ Important: This information is for educational and research purposes only. Always consult with a qualified healthcare professional before use.
Contents
What is IGF-1 LR3?
IGF-1 LR3 is a synthetic analog of Insulin-like Growth Factor-1 with an extended half-life and increased biological activity. It is a 83-amino acid peptide that is produced through recombinant DNA technology, specifically engineered with an arginine substitution at position 3 and an 13-amino acid extension peptide (MFPAMPLSSLIFV) at the N-terminus.
The main improvement of IGF-1 LR3 over native IGF-1 is its reduced binding to IGF-binding proteins (IGFBPs), which increases its bioavailability and half-life from approximately 12 hours to several days. This makes it a potent anabolic peptide for research on muscle growth, tissue repair, and cellular regeneration. IGF-1 LR3 is available in pen and freeze-dried vial formulations for research purposes.
How IGF-1 LR3 Works
IGF-1 LR3 works through multiple mechanisms to promote anabolic and regenerative effects:
IGF-1 Receptor Binding
Binds to IGF-1 receptors with high affinity, activating downstream signaling pathways
Protein Synthesis
Stimulates muscle protein synthesis and inhibits protein breakdown
Reduced Binding
Reduced affinity for IGFBPs increases bioavailability and half-life
IGF-1 LR3 promotes muscle growth, cell proliferation, and differentiation through the PI3K/Akt and MAPK/ERK signaling pathways. Its extended half-life allows for less frequent dosing while maintaining biological activity.
Research Applications
Muscle Growth
Studying hypertrophy, muscle regeneration, and protein synthesis
Tissue Repair
Investigating wound healing and tissue regeneration
Cellular Proliferation
Researching cell growth, differentiation, and anabolic signaling
Bone & Cartilage
Studying osteogenesis and cartilage repair mechanisms
Clinical Studies
Anabolic & Muscle Growth Research
- IGF-1 LR3 has shown significant anabolic effects in both in vitro and in vivo research
- Increased muscle protein synthesis and reduced protein breakdown in animal models
- Stimulates satellite cell proliferation and differentiation for muscle regeneration
- Promotes hypertrophic growth and enhanced muscle fiber size
Extended Half-Life & Bioavailability
- Reduced binding to IGF-binding proteins (IGFBPs) increases bioavailability
- Half-life extended from approximately 12 hours to several days
- Allows for less frequent dosing while maintaining biological activity
- Higher potency compared to native IGF-1 in research models
Regenerative Medicine Research
- Demonstrated potential in wound healing and tissue regeneration models
- Stimulates cell proliferation and differentiation in various cell types
- Investigated for potential applications in musculoskeletal repair
- Promotes osteogenesis in bone repair research
Interactive Dosing Guide
Select your vial size and dose to see the corresponding volume, clicks, dosing frequency, and how many doses per vial:
️ Step 1: Select Your Vial Size
Step 2: Select Your Dose
Common research protocols: 0.01-0.05 mg per injection, typically administered daily
Vial Size
0.1mg Vial
Selected Dose
0.01 mg
Doses per Vial
10 doses
Pen Clicks
30 clicks
Volume
0.30 mL
Protocol Level
Level 1 (Starting)
Recommended Schedule
Once daily - Loading Phase
️ Do not change your dose unless advised by a qualified professional.
Protocol Level Summary
Based on research protocols: 0.01-0.05 mg per injection, typically administered once daily.
| Protocol Level | Target Dose | Frequency | 0.1mg Clicks | 1mg Clicks | Who It\'s For |
|---|---|---|---|---|---|
| Level 1 (Starting) | 0.01 mg | Once daily | 30 clicks | 3 clicks | New users, first week |
| Level 2 (Standard) | 0.02 mg | Once daily | 60 clicks | 6 clicks | After first week, maintenance |
| Level 3 (Advanced) | 0.03-0.04 mg | Once daily | 90-120 clicks | 9-12 clicks | If more response needed |
| Level 4 (Maximum) | 0.05 mg | Once daily | 150 clicks | 15 clicks | Experienced users only |
️ Do not change your dose unless advised by a qualified professional.
Vial Users (Insulin Syringe)
Add 3mL of bacteriostatic water to your freeze-dried vial and mix gently. After reconstitution, use the table below to draw your dose:
Vial Size
0.1mg vial with 3mL bac water
| Dose | Frequency | Units on Syringe | Volume (mL) | Protocol Level |
|---|
️ Always use a new sterile needle and syringe for each injection.
️ Safety & Precautions
IGF-1 LR3 is a potent anabolic peptide with limited human safety data. The potential benefits should be weighed against the risks, including the theoretical risk of promoting cell proliferation in certain contexts.
- Injection site reactions: Redness, tenderness, or pain at injection site
- Hypoglycemia: Potential for blood sugar lowering due to insulin-like effects
- Edema: Possible fluid retention
- Joint pain: Occasional and mild
Important Safety Considerations:
- IGF-1 LR3 is
- Theoretical risk of promoting cell proliferation and tumor growth
- Should be used with caution in research settings only
- Do not use if allergic to IGF-1 LR3 or any ingredients
- Do not use if pregnant or breastfeeding
️ Warning: IGF-1 LR3 is an investigational research peptide with potent anabolic effects. If you experience severe allergic reactions, difficulty breathing, or signs of anaphylaxis, seek immediate medical help.
References
- IGF-1 LR3 Research Overview. Peptide Sciences.
- IGF-1 LR3 Product Information. GlpBio.
- IGF-1 LR3: Mechanism of Action and Research Applications. Journal of Peptide Research.
- IGF-1 LR3 Dosage and Protocol Guide. Peptide Institute.
This information is for educational and research purposes only. Always consult with a qualified healthcare professional.
Last updated: July 2026