Growth
IGF-1 LR3
Healing
0
Amino acids
Molecular weight
Peptide
Type
IGF-1 LR3 is a synthetic 83-amino acid analog of insulin-like growth factor-1 that has never been approved for human use. The N-terminal extension and R3 substitution reduce binding protein interaction, maintaining elevated free circulating levels with ~3x greater potency than native IGF-1.
Top researched benefits
Overview of IGF-1 LR3
Functions as a full IGF-1 receptor agonist activating PI3K/Akt/mTOR and MAPK/ERK pathways. The modifications prevent protein sequestration, maintaining elevated free circulating levels for extended anabolic effects.
Muscle Growth
- 15-20% lean mass gains in 4 weeks through satellite cell activation (rat studies).
- Cancer cachexia rats maintained 30% more muscle versus placebo.
- Creates new muscle fibers via satellite cell differentiation.
Tissue Repair
- Accelerated wound healing in animal models.
- Enhanced connective tissue repair.
Metabolic
- Directs nutrients toward muscle tissue.
- Enhanced lipolysis through IGF-1 pathway.
Storage
Lyophilized: -20°C to -80°C. Reconstituted in acetic acid: 2-8°C for 1 year. Reconstituted in BAC water: use within 7 days
Frequency
Once daily, or split AM/PM for higher doses
Typical Dose
20-100 mcg daily (start low at 20-30 mcg)
Cycle Duration
4-6 weeks maximum
No visual available
Due to this peptide having no amino acids, there is no molecular chain to display.
Chemical Makeup
Key benefits
Approximately 3x more potent than native IGF-1
Promotes muscle hypertrophy and hyperplasia in animal models
15-20% lean mass gains observed in 4-week rat studies
Anti-catabolic effects preserve muscle during cachexia
20-30 hour half-life for sustained effects
Community interest
This peptide is still gaining traction in the community.
Modified Growth Factor Analog | Muscle Growth
This overview is informational and based on aggregated descriptions from studies and user reports.
Was it helpful?YesIGF-1 LR3 Molecular Information
View the scientifc details of IGF-1 LR3.
Molecular Weight
0DaChain Length
0Amino AcidsType
PeptideIGF-1 LR3 Protocols
Subcutaneous or intramuscular injection. CRITICAL: Consume 30-60g fast carbohydrates immediately after injection to prevent hypoglycemia. Never inject before sleep.
| Goal | Dosage | Frequency | Route |
|---|---|---|---|
| Beginner Protocol | 20 | 1 week range | SubQ/IM |
| Intermediate | 40 | 1 week range | SubQ/IM |
| Advanced | 80 | 1 week range | SubQ/IM |
| Women's Protocol | 10 | 1 week range | SubQ/IM |
Reconstitution Instructions
Materials needed:
Steps to reconstitute
- Equilibrate to room temperature (15-30 min)
- Sanitize rubber stopper with alcohol
- Calculate concentration (e.g., 1mg in 2mL = 500mcg/mL)
- Inject diluent slowly along vial wall
- Gently swirl - never shake vigorously
- Allow 2-5 minutes for complete dissolution
- Store immediately at 2-8°C protected from light
- Acetic acid reconstitution: stable 1 year
- BAC water reconstitution: use within 7 days
IGF-1 LR3 Cycle
The IGF-1 LR3 Cycle section explains how long a typical cycle lasts and what to expect during each phase. Over time, your body can become less responsive with continuous use.
Taking breaks between cycles may help maintain effectiveness and support better overall results.
- Week 1-2
- Increased muscle pump and fullness; possible hypoglycemia if carbs inadequate
- Week 2-4
- Enhanced recovery, strength gains, visible fullness, potential water retention
- Week 4-6
- Maximum effects; receptor desensitization approaching; joint stiffness common
- Week 0-0
- Pump loss over 1-2 weeks; strength/size gains may persist with training
Dosing tools
IGF-1 LR3 Peptide Dosage Calculator
Calculate peptide doses with our visual syringe guide.
0.3mL / 30 units
5 units
0.050 mL
1 mL
2 mL
3 mL
5 mL
Custom
Conversion: 1,000 mcg = 1 mg
Injection Results
Based on your vial and dilution inputs.
Safe concentration range
IGF-1 LR3
SINGLE COMPOUNDVolume per injection
0.05
mL
Concentration
10.00
mg/mL
Doses per vial
20
doses
Total injections per vial
20 injections
How it works
Based on a 10 mg IGF-1 LR3 vial diluted with 1 mL of bacteriostatic water, each 500 mcg injection equals 0.05 mL.
Research Purposes Only
These calculators are provided for educational and research purposes only. Always verify calculations and consult with qualified professionals. The information provided is not medical advice. Peptides should only be used in accordance with applicable laws and regulations.
Reference Guide
Dosing Cycle
- Peptide
- IGF-1 LR3
- Dosing
- 20-100 mcg daily (start low at 20-30 mcg)
- Dosing Frequency
- Once daily, or split AM/PM for higher doses
- Cycle Duration
- 4-6 weeks maximum
- Storage
- Lyophilized: -20°C to -80°C. Reconstituted in acetic acid: 2-8°C for 1 year. Reconstituted in BAC water: use within 7 days
Note: Triple agonist; microdose for fewer side effects
Reconstitution Tips
- Use bacteriostatic water (BAC) — contains 0.9% benzyl alcohol for preservation
- Inject water slowly — aim down the vial wall, not directly onto powder
- Never shake — gently swirl or roll the vial until dissolved
- Store properly — refrigerate at 2-8°C after reconstitution
- Use within 28 days — most reconstituted peptides remain stable for about 4 weeks
- Keep sterile — always clean vial tops with alcohol before drawing
Peptide Interactions
Research suggestions of IGF-1 LR3 interactions with other common peptides and substances.
Side effects
Monitor: Be careful when combining IGF-1 LR3 with Cerebrolysin, MK-677.
Contraindications
NEVER approved for human use - research chemical only
Cancer history or undiagnosed growths
May cause organ hypertrophy (heart, intestines)
WADA prohibited - causes failed drug tests
Stop signs
Severe or recurring hypoglycemia despite carbohydrate intake
Unusual growths, lumps, or rapid mole changes
Severe joint pain or carpal tunnel symptoms
Persistent nausea, headaches, or vision changes
Signs of organ enlargement
Extreme fatigue or mental fog
Bad signs
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Frequently asked questions
What benefits can peptides offer in research?
Peptides can support cellular repair, immune function, metabolic health, and tissue regeneration. Research suggests they may help with recovery, sleep quality, skin health, and cognitive function, depending on the specific peptide and its mechanism of action.
What are some exciting applications of peptides in modern science?
Current research explores peptides for longevity, muscle recovery, wound healing, metabolic disorders, and neuroprotection. Scientists are also investigating peptide-based drug delivery and targeted therapies that could offer more precise treatment options.
How do peptides influence health and wellness?
Peptides work by binding to receptors on cells and triggering specific biological responses. Depending on the peptide, they may promote growth hormone release, support collagen production, modulate inflammation, or influence neurotransmitter activity—each with different implications for health and wellness.
Where can I find the latest studies on peptide applications?
Peer-reviewed journals such as Nature, Science, and specialized publications like Peptides and the Journal of Peptide Science publish ongoing research. PubMed and Google Scholar are useful for searching studies by peptide name or condition.
Are there any guidelines for using peptides in research?
Research use of peptides typically follows institutional review board (IRB) protocols and regulatory guidelines. Dosage, administration route, and safety monitoring should align with published literature and applicable regulations in your jurisdiction.
What is the difference between peptides and proteins?
Peptides are short chains of amino acids (typically under 50), while proteins are longer chains that fold into complex structures. Peptides are often more stable, easier to synthesize, and can cross cell membranes more readily, making them attractive for therapeutic applications.
How should peptides be stored?
Most peptides require refrigeration (2–8°C) and protection from light. Reconstituted peptides often have shorter stability and may need to be used within days or weeks. Always follow the manufacturer's or research protocol's storage instructions.
Can peptides be taken orally?
Some peptides are bioavailable orally, but many are broken down by digestive enzymes before reaching the bloodstream. Subcutaneous injection, nasal administration, or other routes are often used in research to improve bioavailability. The optimal route depends on the specific peptide.
IGF-1 LR3Research References
IGF-1 LR3 is a limited compound
IGF-1 LR3
IGF-1 LR3 is a limited compound
Rat Muscle Hypertrophy Study - Florini et al.
2.5mg/kg/day for 4 weeks showed 2.5x greater anabolic response compared to native IGF-1. Satellite cell activation and protein synthesis increased 50%.
1996
Fetal Sheep Metabolic Study
Acute infusion suppressed insulin secretion by 66%. Study halted early due to 4 animal deaths from hypoglycemia.
2000
Cancer Cachexia Rat Model
0.3mg/kg/day for 14 days showed 30% lean mass preservation during cachexia.
1998
UK Biobank Cancer Association
Elevated IGF-1 associated with multiple cancers including thyroid, colorectal, breast, prostate, melanoma.
2023