Melanotan‑2
Synthetic α-MSH analog: pigmentation and libido modulation
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WHAT IS MELANOTAN-2?
Detailed overview
Melanotan-2 (MT-II) is a synthetic cyclic heptapeptide α-melanocyte-stimulating hormone (α-MSH) analog, originally developed at the University of Arizona for skin cancer prevention research. It is a non-selective agonist of MC1R, MC3R, MC4R and MC5R melanocortin receptors. Its main action via MC1R activation enhances melanin synthesis (melanogenesis), producing a darker "from within" tan with minimal UV exposure. MC4R activation also drives libido side-effects, which led to the development of PT-141 (bremelanotide). Appetite suppression is also documented. Available in two forms: subcutaneous injection (community standard) and intranasal spray (experimental, lower bioavailability).
Type
Cyclic heptapeptide (MC1-5R agonist)
Structure
Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH₂
Molecular weight
~1024 Da
Target area
Skin pigmentation, libido
Storage
2–8°C (reconstituted)
Stability
25–30 days (reconstituted)
Skin / sexual health
Melanocortin (MC1R / MC4R) receptor activation produces two main effects: skin pigmentation (melanin synthesis, UV protection, cosmetic) and centrally-mediated libido / sexual response. The peptide also supports collagen I/III and elastin synthesis, improving skin elasticity and texture, youth markers measurably rise. Acute effect (libido, energy) often within 30–60 min; lasting effects (tone, pigmentation) build over 1–3 weeks. Routine mole checks recommended.
Data console
Lab data
Research indications
Investigated uses and mechanisms
Libido & sexual function
Central (MC4R) pathway activation; libido and function improve.
Skin pigmentation
Increased melanin synthesis (UV-protection, cosmetic aim).
Collagen / skin elasticity
Rises in youth markers (collagen I, III).
Reconstitution
How to prepare, step by step
Important
Sterile technique required. Use bacteriostatic water (BAC) only. Never distilled or tap water.
- 01
10 mg lyophilized vial + 5 ml bacteriostatic water
- 02
Inject water slowly onto vial wall, NOT directly onto powder
- 03
Wait 30 seconds, swirl gently (DO NOT shake)
- 04
Storage: refrigerated (2–8°C), max 28 days
Quality indicators
How to recognize a pure peptide
Purity markers
4White / off-white powder
Typical appearance of sterile lyophilized peptide.
Comes with COA (Certificate of Analysis)
Independent lab analysis, ≥98% purity.
Intact, sealed vial
Rubber stopper + aluminum crimp intact, ensuring sterility.
Dissolves clear
Clear solution after reconstitution, no sediment.
Use caution
1Storage temperature
Extended room-temp exposure may reduce potency.
Do not use
2Discoloration / sediment
Yellow, cloudy or particulate solution, indicates degradation, do not use.
Damaged packaging
Cracked vial or loose cap, sterility compromised, discard.
Interactions & stacks
What to combine and what to avoid
GHK-Cu
SynergisticCopper peptide: skin regeneration and epigenetic modulation
PT-141
SynergisticMelanocortin receptor agonist: FDA approved (bremelanotide)
GHK-Cu
SynergisticComplementary skin-regeneration agents.
Vitamin C / Zinc / B-complex
SynergisticSupports collagen synthesis and antioxidant capacity.
Caffeine
Requires timingCompatible with morning dosing; avoid late-day stacking.
Retinoids
Use cautionSkin irritation may stack, separate timing.
NSAIDs (Ibuprofen, ASA)
Use cautionLong-term concurrent use may blunt regenerative effects.
Alcohol
AvoidReduces recovery and increases side-effect risk.
Safety
Side effects, stop signs, contraindications
Side effects · 5
- Nausea on first doses
- Increased pigmentation (expected effect)
- Reduced appetite
- Blood-pressure increase
- Spontaneous erection (PT-141 / Melanotan-type)
Contraindications · 5
- Pregnancy and breastfeeding
- Active malignancy
- Known allergy to the peptide or its components
- Severe hepatic or renal impairment (medical consultation required)
- Age under 18
Related Peptides
Same therapeutic category
Studies
Related research and clinical findings
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The information here is strictly for educational and scientific purposes. It does not replace medical advice or clinical consultation, and it does not encourage illegal substance or pharmaceutical use. Data is sourced. When in doubt, consult your doctor.