IGF-1 LR3
Modified IGF-1 with extended half-life. Can create new muscle cells (not just enlarge existing ones), making it one of the most potent muscle-building peptides.
Key Facts
- ClassificationPeptide — Long-lasting IGF-1 that drives muscle growth and cell proliferation. Limited human data.
- Primary BenefitsMuscle Growth (8/10) · Injury Healing (5/10) · Fat Loss (4/10)
- AdministrationInjection
- Typical Dose20-50 mcg subq daily, after a workout or split between morning and evening. Cycle for 4-6 weeks max.
- Evidence StrengthEmerging — 20 peer-reviewed studies referenced · Community sentiment 6/10
- Stacks Well WithCJC-1295 with DAC, MK-677
- Legal StatusResearch Use Only · not prescribable in US · WADA prohibited
Quick Facts
- From price
- $60
- Type
- peptide
- Administration
- Injection
- Evidence
- emerging
- Studies referenced
- 20
- Community sentiment
- 6/10
- Stacks with
- 2 peptides
- Regulatory
- Research Use Only
Top benefits
Dosing
20-50 mcg subq daily, after a workout or split between morning and evening. Cycle for 4-6 weeks max.
Benefit Profile
| Vendor | Variant | Price | |
|---|---|---|---|
| Swiss Chems ⚠ FDA warning letter received late 2024 | 1mg | $74.95 | |
| Amino Asylum ⚠ Reported federal raid in 2025 | 1mg | $59.99BEST | |
| Peptide Sciences ✕ Announced voluntary shutdown — stock availability may be limited or unavailable. Pricing data may be outdated. | 1mg | $89.00 | Out of stock |
Stacks Well With
CJC-1295 with DAC
Long-lasting growth hormone booster. The DAC modification keeps it active for days, producing steady GH elevation for muscle growth, fat loss, and recovery.
MK-677 (Ibutamoren)
Orally active ghrelin receptor agonist (not a peptide). Boosts growth hormone and IGF-1. Known for improving deep sleep, increasing appetite, and gradually improving body composition.
Related 💪 Muscle Growth Peptides
Other peptides strong in muscle growth
10x more potent IGF-1 variant with very short duration. Targets local muscle.
GHRP-28/10Stronger GH release than GHRP-6, with less appetite stimulation.
Follistatin 3448/10Blocks myostatin to remove the genetic cap on muscle growth.
Ipamorelin/CJC-1295 Blend8/10Pre-mixed combo of Ipamorelin + CJC-1295 for convenient GH boosting.
PEG-MGF (Mechano Growth Factor)8/10Long-lasting muscle growth factor released after exercise-induced damage.
CJC-1295 (no DAC) / Mod GRF 1-297/10Growth hormone releaser that mimics natural pulsatile GH patterns.