PT-141 vs IGF-1 LR3
Head-to-head comparison of PT-141 (Bremelanotide (Melanocortin Receptor Agonist)) and IGF-1 LR3 (Insulin-like Growth Factor-1 Long R3) — benefits, dosing, side effects, research data, and where to buy.
| Property | PT-141 | IGF-1 LR3 |
|---|---|---|
| Category | Performance | Performance |
| Full Name | Bremelanotide (Melanocortin Receptor Agonist) | Insulin-like Growth Factor-1 Long R3 |
| Molecular Weight | 1,025.2 Da | 9,117 Da |
| Half-Life | ~2.7 hours | ~20-30 hours |
| Amino Acids | 7 | 83 |
| Typical Dose | 1.75 mg | 20-100 mcg |
| Route | SC | IM / SC |
| Purity | — | — |
| Studies Count | 178 | 298 |
| Research Status | FDA Approved | Pre-clinical |
PT-141 Benefits
- ✓Enhances sexual desire and arousal
- ✓Works through CNS (not vascular)
- ✓FDA-approved for HSDD
- ✓Effective for both men and women
- ✓Does not require sexual stimulation to work
IGF-1 LR3 Benefits
- ✓Promotes muscle hyperplasia (new muscle cells)
- ✓Extended half-life vs native IGF-1
- ✓Enhanced protein synthesis
- ✓Improved nutrient partitioning
- ✓Anti-catabolic effects
PT-141 Dosing
Standard: 1.75 mg SC, 45 min before activity|Max frequency: Once every 24 hours|Max: 8 doses per month|Men (off-label): 1-2 mg SC as needed
IGF-1 LR3 Dosing
Standard: 20-50 mcg IM post-workout|Advanced: 50-100 mcg IM or SC daily|Cycle: 4-6 weeks on, 4 weeks off
PT-141 Side Effects
- ⚠Common: Nausea (40%), flushing, headache, injection site reactions
- ⚠Moderate: Elevated blood pressure (transient), fatigue
- ⚠Serious: Focal hyperpigmentation with repeated use
- ⚠Contraindications: Uncontrolled hypertension, cardiovascular disease
IGF-1 LR3 Side Effects
- ⚠Common: Hypoglycemia (dose-dependent), joint pain, water retention
- ⚠Moderate: Gut growth concern (high doses), acromegaly-like symptoms
- ⚠Serious: Theoretical cancer risk (prolonged high-dose use)
Research Overview
PT-141
PT-141 has robust clinical evidence including multiple Phase III trials. FDA-approved in 2019. Unique mechanism of action through melanocortin-4 receptors in the brain. Well-characterized safety and efficacy profile.
IGF-1 LR3
IGF-1 LR3 has extensive in vitro and animal data. Its role in muscle hyperplasia is well-documented. The extended half-life modification provides practical advantages over native IGF-1.
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