Melanotan II (MT-II)
Synthetic Melanocortin Peptide · Tanning & Sexual Function
Overview
Melanotan II is a synthetic analog of alpha-melanocyte-stimulating hormone (α-MSH) that activates melanocortin receptors throughout the body. MC1R activation triggers melanin production for tanning, while MC4R affects sexual arousal and appetite control.
Binds to melanocortin receptors (MC1R for tanning, MC4R for sexual function and appetite) to stimulate melanin production, libido, and suppress appetite through hypothalamic pathways.
Stimulates natural melanin production for tanning without requiring UV exposure.
Increased melanin provides natural SPF protection against sun damage.
May help address certain pigmentation disorders.
Mechanism
Melanotan II is a synthetic analog of alpha-melanocyte-stimulating hormone (α-MSH) that activates melanocortin receptors throughout the body. MC1R activation triggers melanin production for tanning, while MC4R affects sexual arousal and appetite control.
Binds to melanocortin receptors (MC1R for tanning, MC4R for sexual function and appetite) to stimulate melanin production, libido, and suppress appetite through hypothalamic pathways.
Stimulates natural melanin production for tanning without requiring UV exposure.
Research areas
- Melanotan II is a synthetic analog of alpha-melanocyte-stimulating hormone (α-MSH) that activates melanocortin receptors throughout the body. MC1R activation triggers melanin production for tanning, while MC4R affects sexual arousal and appetite control.
- Binds to melanocortin receptors (MC1R for tanning, MC4R for sexual function and appetite) to stimulate melanin production, libido, and suppress appetite through hypothalamic pathways.
- Stimulates natural melanin production for tanning without requiring UV exposure.
- Increased melanin provides natural SPF protection against sun damage.
- May help address certain pigmentation disorders.
Research notes
- Nausea (pre-treatment with antiemetics recommended)
- Temporary blood pressure elevation
- Severe persistent nausea or vomiting
- Chest pain or significant blood pressure elevation
- Mole changes (size, shape, color) - monitor closely
Pharmacokinetics
- Stimulates natural melanin production for tanning without requiring UV exposure.
Protocol Variations
- Multiple approaches exist - compare before choosing
- Different sources recommend different protocols for this peptide. Review each approach and consider your goals, tolerance, and level before choosing.
Traditional Loading Protocol
- Source: Legacy Bodybuilding Forums
- "Aggressive daily loading to build melanin quickly"
- A decade-old protocol involving daily injections at higher doses for 1-2 weeks before maintenance. This approach is associated with more side effects including nausea and increased freckling/mole development. Dosing on non-tanning days can lead to uneven pigmentation.
- Higher starting doses (250-500mcg)
- Daily dosing regardless of tanning
Pre-Tan Only Protocol
- Source: More Plates More Dates
- "ONLY dose on tanning days - loading phase is unnecessary"
- NEVER administer on non-tanning days. Always tan within 1 hour of injection. Start extremely low (50-75mcg) and increase by 25mcg every 3 sessions. This dramatically reduces freckling, uneven pigmentation, and side effects. The traditional loading phase is considered counterproductive - it builds melanin in areas with…
- Start at only 50-75mcg (much lower)
- ONLY inject on days you tan - never otherwise
References
- pubmed.ncbi.nlm.nih.gov/15996790/
- pubmed.ncbi.nlm.nih.gov/11035391/
- pubmed.ncbi.nlm.nih.gov/8637402/
- pubmed.ncbi.nlm.nih.gov/11045725/
Questions
Which Melanotan II protocol causes less nausea—loading or pre-tan only?
The pre-tan-only protocol causes significantly less nausea because you only inject on tanning days at very low starting doses (50-75mcg). The traditional loading phase with daily injections at higher doses causes much more nausea. Starting extremely low and increasing gradually by 25mcg minimizes side effects.
Does Melanotan II really enhance sexual function?
Yes. Clinical trials show 80% response rate for erectile function in men with psychogenic ED and 73% of women reporting arousal within 24 hours. Effects are achieved through MC4R activation in the brain, triggering natural sexual responses without direct genital action.
Will Melanotan II cause permanent mole changes?
Possible. MT-II activates melanocortin receptors broadly, including in existing moles and freckles. Some users report permanent enlargement or darkening of existing moles. Regular skin monitoring is essential—any rapidly changing mole requires dermatology evaluation regardless of MT-II use.