IGF-1 LR3vsLL-37
IGF-1 LR3 vs LL-37 — independent comparison of uses, administration, pricing across providers, and key differences. Last reviewed April 21, 2026.
Quick Verdict
Based on clinical evidence and real patient data
A long-acting analog of insulin-like growth factor-1 (IGF-1) with an arginine substitution that reduces binding to IGF-binding proteins, extending its half-life. IGF-1 is the primary downstream mediator of growth hormone's anabolic effects.
The only known human cathelicidin antimicrobial peptide, naturally produced by immune cells and epithelial tissues. LL-37 has broad-spectrum antimicrobial activity alongside potent immunomodulatory and wound-healing properties.
Best choice depends on your insurance, budget, and treatment history.Take the quiz to get a personalized recommendation.
IGF-1 LR3 vs LL-37: At a Glance
Full comparison across all key factors.
| Factor | IGF-1 LR3 | LL-37 |
|---|---|---|
| Category | growth-hormone | recovery |
| Also Known As | Insulin-like Growth Factor-1 Long R3, Long R3 IGF-1 | Cathelicidin, hCAP18/LL-37 |
| Administration | Subcutaneous or intramuscular injection | Topical or subcutaneous injection |
| Prescription | Required | Required |
| Providers | 3 providers | 3 providers |
| Common Uses |
|
|
Data sourced from FDA prescribing information and peer-reviewed clinical trials. Prices reflect telehealth platform costs as of April 21, 2026. See our methodology.
Pricing by Provider
3 providers offer both IGF-1 LR3 and LL-37.
| Provider | IGF-1 LR3 | LL-37 | Consultation | Lab Testing |
|---|---|---|---|---|
 | $55/one-time | $50/one-time | Async Telehealth | No |
 | $250/monthly | $180/monthly | Video Telehealth | Yes |
 | $320/monthly | $240/monthly | Video Telehealth | Yes |
Key Differences
IGF-1 LR3
A long-acting analog of insulin-like growth factor-1 (IGF-1) with an arginine substitution that reduces binding to IGF-binding proteins, extending its half-life. IGF-1 is the primary downstream mediator of growth hormone's anabolic effects.
LL-37
The only known human cathelicidin antimicrobial peptide, naturally produced by immune cells and epithelial tissues. LL-37 has broad-spectrum antimicrobial activity alongside potent immunomodulatory and wound-healing properties.
Which Is Right for You?
Choose IGF-1 LR3if…
- You want a growth-hormone medication
- You prefer subcutaneous or intramuscular injection administration
- 3 providers available on our platform
- Your primary goal is muscle hypertrophy
- Your primary goal is fat loss
Choose LL-37if…
- You want a recovery medication
- You prefer topical or subcutaneous injection administration
- 3 providers available on our platform
- Your primary goal is antimicrobial defense
- Your primary goal is chronic wound healing
Frequently Asked Questions
What is the difference between IGF-1 LR3 and LL-37?
Which is cheaper, IGF-1 LR3 or LL-37?
Can I switch from IGF-1 LR3 to LL-37?
Medical Disclaimer
This comparison is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider before starting, stopping, or changing any medication. Individual results may vary. The information presented reflects publicly available data and may not account for your specific health situation.