Melanotan II is the most controversial peptide on this list. It activates melanocortin receptors to produce a real tan without UV (or a deeper one with minimal sun). The tanning effect can start within 5 doses, and it clearly works. But it also darkens existing moles, can create new ones, and there are documented melanoma cases in users (causation vs correlation is debated but the risk is real enough that clinical development was abandoned). The community uses it anyway. If you're going to, get a full-body mole check from a dermatologist first, photograph everything, and check in every 3-6 months. Non-negotiable.
Melanotan II Protocol
Dose: 0.25-0.5mg daily (loading), 0.5-1mg 2x/week (maintenance) | Frequency: Daily during loading (7-14 days), then 2x/week for maintenance | Cycle: Loading 7-14 days, then maintenance as desired. Take breaks. | Route: SubQ
Start at the lowest dose (0.25mg) and assess tolerance. Get a full-body mole check from a dermatologist BEFORE starting and every 3-6 months during use. Photograph all existing moles as a baseline. This is non-negotiable.
Melanotan II Effects
Skin tanning (90%). Significant darkening of skin tone, even with minimal UV exposure. The whole point
Mole darkening (60%). Existing moles become more prominent and darker. Monitor all moles closely
New mole formation (35%). New moles can appear, sometimes within days of first injection. Get a baseline skin check first
Increased libido (45%). The same receptors that darken your skin also happen to control sexual arousal. Side benefit that most people notice.
Appetite suppression (30%). Less hunger. The melanocortin system (same receptors) also controls appetite. Mild at normal doses.
Melanotan II Side Effects
Nausea (45%). Very common, especially during loading. Pinning before bed is the move. You sleep through the worst of it.
Facial flushing (35%). Your face gets warm and flushed within 30 minutes. Harmless but noticeable.
Mole changes (60%). Existing moles get darker. New ones can appear. This is the one you actually need to monitor. Get a derm baseline first.
Spontaneous erections (25%). For guys: random erections 1-5 hours after pinning. It's the melanocortin pathway cross-reacting. Not subtle.
Fatigue / yawning (20%). You'll yawn a lot and feel sleepy for a few hours after. Another reason to pin at night.
Melanotan II Dosing by Use Case
Condition
Dose
Duration
Notes
UV-free or UV-reduced tanning
0.25-0.5mg daily (loading 7-14 days), then 0.5-1mg 2x/week
Loading 7-14 days, maintenance as desired
The primary use case. Melanotan II flips on the receptors that control your skin's pigment production (MC1R). A real tan develops even with minimal UV exposure. Start at 0.25mg to assess tolerance. The nausea is worst during loading. Pin before bed and sleep through it.
Fair-skinned individuals seeking base tan
0.25mg daily for 14 days
14-day loading, then 0.5mg 2x/week
Very fair-skinned people, the 'I burn under a desk lamp' crowd, respond most dramatically. The tan builds from nothing. Start low. The mole darkening is most pronounced in fair-skinned users. Get your baseline dermatologist check BEFORE starting. Non-negotiable.
Maintenance tanning
0.5-1mg once or twice per week
Ongoing with breaks
After the loading phase, the tan maintains with much less frequent dosing. Some people go to once every 2 weeks during maintenance. Take breaks. The longer you run it continuously, the more mole changes accumulate.
Melanotan II Results Timeline
Day 1-3, Nausea and flushing: Side effects peak during the first few days of loading. Nausea, facial flushing, yawning, fatigue. Pin before bed. The tan hasn't started yet.
Day 3-7, First color changes: Existing freckles and moles darken first. Subtle overall skin tone shift begins. Any UV exposure (even incidental) accelerates the effect.
Week 1-2, Visible tan developing: Noticeable color change. The tan is real, not surface-level. Melanin is being produced. Nausea subsides as your body adjusts to the dose.
Week 2+, Transition to maintenance: Switch from daily loading to 1-2x/week maintenance. The tan deepens with any sun exposure. Monitor all moles every 2-4 weeks during active use. Book a dermatologist check at 3 months.
Frequently Asked Questions About Melanotan II
What is Melanotan II?
Melanotan II (MT-2) is a synthetic melanocortin agonist developed at the University of Arizona in the 1990s. It activates melanocortin receptors (the ones that control your skin's pigment factory) telling them to crank out more melanin. A real tan without UV exposure. Clinical development was abandoned due to safety concerns around mole changes and theoretical melanoma risk. People buy and use it anyway.
Is Melanotan II safe?
This is the honest answer: we don't know for certain. Small clinical trials showed it works for tanning. Safety concerns ended pharmaceutical development. It darkens existing moles (60% of users), can create new moles (35%), and there are documented melanoma cases in users. Causation vs correlation is debated. If you use it: get a full-body mole check from a dermatologist before starting, photograph all existing moles, and get rechecked every 3-6 months. Non-negotiable.
What are the side effects of Melanotan II?
Nausea (45%) is the big one, especially during loading. Pin before bed and sleep through it. Facial flushing (35%), mole darkening (60%), new mole formation (35%), spontaneous erections in men (25%), fatigue/yawning (20%). The mole changes are the safety concern, not the nausea. Everything else is transient.
What is the best Melanotan II dosage?
Start at 0.25mg daily during loading (7-14 days). Increase to 0.5mg if tolerated. For a 10mg vial reconstituted with 2mL of bacteriostatic water, 0.25mg is 5 units on a U-100 insulin syringe. After loading, maintain with 0.5-1mg once or twice per week. Lower doses = slower tan but fewer side effects.
Does Melanotan II cause melanoma?
There are documented cases of melanoma in Melanotan II users (Hjuler et al. 2014). Causation has not been established. Melanotan II stimulates melanocytes, and overstimulating the cells that make your pigment could, in theory, push them toward cancer in people who are already at risk. That sentence is not fun to read. It's also not fun to skip. The risk is not zero. If you have a personal or family history of melanoma, do not use this. For everyone else: dermatologist monitoring is mandatory.
How do you reconstitute Melanotan II?
Add 2mL of bacteriostatic water to a 10mg vial. That gives you 5mg per mL. For a 0.25mg dose, draw 5 units on a U-100 insulin syringe. For 0.5mg, draw 10 units. For 1mg, draw 20 units. Swirl gently. Never shake. Refrigerate after reconstitution. Protect from light. Use within 4-6 weeks.
Evidence
Early research. Melanotan II was developed in the 1990s at the University of Arizona but never completed clinical development. Small trials (20-100 participants) showed it works for tanning, but safety concerns around mole changes and potential melanoma risk ended serious pharmaceutical interest. It remains widely used underground despite having the weakest evidence profile of any popular peptide.
Approval status: Abandoned clinical
References
Dorr RT et al. Evaluation of melanotan-II, a superpotent cyclic melanotropic peptide in a pilot phase-I clinical study Life Sci, 1996. PMID 8637402
Hadley ME et al. Melanocortin peptide therapeutics: historical milestones, clinical studies and commercialization Peptides, 2006. PMID 16412534
Nelson ME et al. Melanotan II injection resulting in systemic toxicity and rhabdomyolysis Clin Toxicol (Phila), 2012. PMID 23121206
Hjuler KF et al. Melanoma associated with the use of melanotan-II Dermatology, 2014. PMID 24355990
Callaghan DJ et al. A glimpse into the underground market of melanotan Dermatol Online J, 2018. PMID 30142729
Gilhooley E et al. Melanotan II User Experience: A Qualitative Study of Online Discussion Forums Dermatology, 2021. PMID 34464955
Storage
Lyophilized: Refrigerate at 2-8C. Protect from light.
Reconstituted: Refrigerate. Use within 4-6 weeks. Protect from light.
Water: Bacteriostatic water, 2mL per 10mg vial.
Needle: 29-31 gauge, 0.5 inch for subcutaneous injection
These statements have not been evaluated by the FDA. This content is for educational purposes only. Consult a healthcare professional before starting any protocol. vialprep sells injection supplies, not compounds.
