Melanotan II
A fast-acting peptide for tanning, libido enhancement, and appetite control. Melanotan II is a synthetic peptide that stimulates melanin production (tanning) and has effects on sexual function and appetite. More potent than Melanotan I with additional effects on libido. Not FDA-approved; used in research settings.
Key Characteristics
- Length: 7 amino acids(Cyclic structure.)
- Origin: α-MSH analog(Synthetic melanocortin receptor agonist.)
- FDA Status: Not approved(Research use only.)
- Primary Use: Melanin stimulation(Tanning + additional MC receptor effects.)
Overview
Core Benefits
Key AdvantagesThese are educational summaries of commonly discussed effects in wellness/regenerative contexts, not guarantees.
Melanotan II Results Timeline
ProgressionTimeline is illustrative and non-guaranteed. Outcomes vary and are commonly discussed alongside training, nutrition, sleep, and cycling practices.
How It WorksMelanocortin Agonist — Non-Selective (MC1R/MC3R/MC4R)
Receptor → Multi-Receptor Signal → Tanning & Libido → Outcomes
MC1R + MC3R + MC4R (Multiple Melanocortin Receptors)
Melanotan-2 activates multiple melanocortin receptors: MC1R (tanning), MC3R/MC4R (sexual function, appetite). This broad activation produces potent tanning but also causes significant off-target effects that Melanotan-1 avoids.
Multi-Receptor cAMP → Melanin + Central Effects
MC1R activation drives melanin production (same as MT-1). MC3R/MC4R activation in the brain produces sexual arousal effects (similar to PT-141, which was derived from MT-2) and appetite modulation. Nausea is common from central melanocortin activation.
Rapid Tanning + Libido Effects + Appetite Suppression
Faster and more dramatic tanning than Melanotan-1. Significant libido increase. Moderate appetite suppression. Possible nausea, especially at higher doses or during loading. The multi-receptor profile creates a broader but less controllable effect.
Fast Tanning + Flushing + Libido Increase
Facial flushing within hours of first doses. Tanning visible within 1-2 weeks. Libido increase is common and sometimes pronounced. Nausea at higher doses. More dramatic results but more side effects than Melanotan-1.
What Makes This Peptide Different
Melanotan-2 is the more potent but less selective melanocortin. It produces faster, darker tanning than MT-1 but with significant off-target effects (libido, nausea, appetite changes). PT-141 (Bremelanotide) was actually derived from MT-2 research — isolating the sexual function effects via MC3R/MC4R selectivity.
Top Melanotan II Vendors
Dosing ProtocolTanning
Educational reference only. Individual responses vary. Consult healthcare provider before use.
Why This Dosing Protocol
Why loading + maintenance? Same melanin-building logic as MT-1. Daily loading for 2-3 weeks, then 1-2x/week to maintain. MT-2 achieves results faster due to stronger melanocyte stimulation.
Diagrams
Reconstitution Calculator
Dilution math and unit conversions. Prefilled using a common vial size for this peptide.
Open calculatorEducational Videos
How to Reconstitute Peptides
Handling
Educational overview on storage, labeling, and traceability considerations for lab environments. Consult primary literature and vendor documentation for specifics.
- Freezer (-20°C): 1+ year
- Refrigerator (2-8°C): 1-3 months
- Room temperature: 2-3 weeks (emergency only)
- MUST refrigerate at 2-8°C
- 4-week maximum shelf life
- NEVER freeze after reconstitution
- Use bacteriostatic water for multi-dose
Storage & Handling Guide
Learn proper storage temperatures, shelf life timelines, reconstitution best practices, and travel tips for lyophilized and reconstituted peptides.
FAQ
What are Melanotan II's effects beyond tanning?
Beyond stimulating melanin production (tanning), Melanotan II has effects on sexual function (may increase libido and cause erections) and can reduce appetite. These additional effects are due to its action on melanocortin receptors throughout the body, not just in skin cells.
What are the two types of melanin and which does Melanotan-2 stimulate?
Humans produce two types: eumelanin (brown/black, protective) and pheomelanin (red/yellow, potentially harmful). Melanotan-2 activates MC1R receptors to increase eumelanin synthesis. This matters because eumelanin absorbs UV radiation and dissipates it as heat, while pheomelanin generates DNA-damaging free radicals when exposed to UV. The tan from Melanotan-2 is genuine eumelanin-based protection.
Why do redheads burn instead of tan?
Red hair is caused by MC1R gene variants that shift melanin production toward pheomelanin instead of eumelanin. Pheomelanin provides almost no UV protection and actually generates free radicals in sunlight. This is why redheads burn easily and have higher melanoma rates. Melanotan-2 can partially override these MC1R variants, allowing eumelanin production even in people who normally can't tan.
How is Melanotan-2 different from Melanotan-1?
Melanotan-2 is cyclic (ring structure) vs Melanotan-1's linear form, making it more potent but less selective. MT-2 activates MC1R (tanning), MC3R, MC4R, and MC5R. This broader activity causes its sexual effects (erections, libido via MC3R/MC4R) and appetite suppression. Melanotan-1 is more selective for MC1R, so it mainly just tans without the sexual/appetite effects. MT-1 is FDA-approved; MT-2 is not.
What are the side effects of Melanotan-2?
Common: nausea, facial flushing, fatigue, spontaneous erections, increased libido, decreased appetite. Moles and freckles may darken (monitor for changes). More concerning: some reports of new mole development or changes to existing moles — any suspicious changes should be evaluated by a dermatologist. It's not FDA-approved and long-term safety is not established.
How long does reconstituted peptide last?
Once mixed with bacteriostatic water, peptides remain stable for up to 4 weeks when refrigerated at 2-8°C (36-46°F). Unopened powder can last 1+ year in the freezer. Get our complete Storage & Travel Guide.
Is this peptide legal to purchase?
Peptides sold "for research purposes only" are legal to purchase in the US, but are not FDA-approved for human use outside of specific medical applications. Always consult a healthcare provider before use.
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Melanotan II Research Articles
PT-141 Dosing: 500mcg On-Demand Protocol
Timing matters more than dose — too early and effects fade. Covers 500mcg starting dose, FDA data, and nausea management.
guidesMelanotan-2 Dosing: 100-250mcg Loading Protocol
Starting at 500mcg is the #1 mistake — and the reason most quit. Loading schedule by skin type, maintenance timing, and SubQ vs nasal comparison.
guidesMelanotan-1 Dosing: 250mcg 2x/Week Protocol
The FDA implant uses 16mg — community protocols use 250mcg. Covers loading, maintenance, UV timing, and reconstitution math.
resultsMelanotan-2 Results: Week-by-Week Timeline
Your Fitzpatrick skin type determines whether MT-2 works in 5 days or 5 weeks. Full timeline by phase, use case, and what to expect.
Scientific Sources
The following peer-reviewed studies and official resources provide additional scientific context for this peptide:
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