Melanotan II + PT-141 Blend
This blend pairs Melanotan II (non-selective melanocortin agonist for tanning/pigmentation) with PT-141 (bremelanotide — selective MC3R/MC4R agonist for sexual function). Together they provide complementary melanocortin pathway stimulation for research into photoprotection, pigmentation, and sexual arousal mechanisms.
⚡ Quickstart Highlights
Dosing & Reconstitution Guide
Educational guide for reconstitution and dosing of both peptides
Combined Component Schedule (each 10 mg vial prepared separately with 3 mL)
| Component | Period / Phase | Amount per Administration | U-100 Units (mL) |
|---|---|---|---|
| PT-141 | Initial / Titration | 500–750 mcg | 15–22 units (0.15–0.22 mL) |
| PT-141 | Standard | 1,000–1,500 mcg | 30–45 units (0.30–0.45 mL) |
| PT-141 | Full / FDA-approved product amount | 1,750 mcg (1.75 mg) | 52 units (0.52 mL) |
| Melanotan II | Week 1 | 250 mcg | 7.5 units (0.075 mL)* |
| Melanotan II | Week 2 | 500 mcg | 15 units (0.15 mL) |
| Melanotan II | Weeks 3–4 | 750 mcg | 22 units (0.22 mL) |
| Melanotan II | Weeks 5+ loading | 1,000 mcg | 30 units (0.30 mL) |
| Melanotan II | Maintenance | 500–1,000 mcg | 15–30 units (0.15–0.30 mL) |
PT-141 frequency: On demand, at least 45 minutes before activity, no more than once in 24 hours or eight times per month.
Melanotan II frequency: Once daily during the loading rows; two to three times weekly for the maintenance row.
Reconstitution Steps (prepare each vial separately)
- Confirm the correct PT-141 or Melanotan II vial and clean its stopper.
- Draw 3.0 mL bacteriostatic water and add it slowly down the wall of that vial.
- Gently swirl or roll until fully dissolved; do not shake.
- Label the vial with peptide name, concentration, and preparation date; refrigerate at 2–8 °C (35.6–46.4 °F), protected from light.
Important: This guide is for educational purposes only and is not medical advice. For research use only. Not for human consumption.
Supplies Needed
Plan based on an 8–16 week stack schedule. The two peptide vials remain separate; the administration supplies are shared.
| Item | 8 weeks | 12 weeks | 16 weeks |
|---|---|---|---|
| PT-141 Vials (10 mg each) | 2 vials | 3 vials | 4 vials |
| Melanotan II Vials (10 mg each) | 6 vials | 9 vials | 12 vials |
| Shared U-100 Insulin Syringes | 64 syringes | 96 syringes | 128 syringes |
| Shared Bacteriostatic Water (10 mL bottles) | 24 mL, 3 bottles | 36 mL, 4 bottles | 48 mL, 5 bottles |
| Shared Alcohol Swabs | 128 swabs, 2 boxes | 192 swabs, 2 boxes | 256 swabs, 3 boxes |
Safe disposal: Place used needles and syringes in a puncture-resistant sharps container.
How This Works
Melanotan II (MT-II) is a cyclic α-MSH analog that non-selectively activates MC1R (melanogenesis), MC3R (energy/appetite), MC4R (sexual arousal/appetite), and MC5R (exocrine glands). Its key research application is photoprotective tanning via MC1R-stimulated eumelanin synthesis in melanocytes. The cyclic structure provides improved protease resistance versus linear α-MSH.
PT-141 (bremelanotide) is derived from MT-II but with greater selectivity for MC3R and MC4R — the receptors mediating sexual arousal — with lower MC1R activity (less tanning). FDA-approved as Vyleesi for HSDD. Combined, the blend allows simultaneous research into both arms of the melanocortin system at lower per-component doses.
Potential Benefits & Side Effects
Potential Benefits
- MT-II: strong melanogenesis via MC1R — deep tan with UV exposure.
- PT-141: MC3R/MC4R activation produces central sexual arousal without vascular action.
- Lower per-component doses vs standalone — may reduce side effects.
- Convenient single vial for dual-mechanism research.
- PT-141 FDA approved (Vyleesi) — strongest clinical data of any peptide in this class.
Side Effect Profile
- Nausea — MT-II most common adverse effect; dose-dependent.
- Flushing, facial redness within 30–60 min.
- Spontaneous erections (MT-II — MC4R stimulation).
- Darkening of existing moles or nevi — monitor skin.
- Elevated blood pressure (PT-141 component — monitor in hypertensive individuals).
- UV exposure required for tanning but also increases skin cancer risk — monitor lesions.
Storage Instructions
| State | Temperature | Duration |
|---|---|---|
| Lyophilized | −20°C (−4°F) | −20°C, up to 24 months |
| Reconstituted | 2–8°C | Up to 28 days |