Melanotan II
Published · Researched 2026-09-21
Category: Libido, Tanning, Sleep & Niche · Research date: 2026-09-20 · Slug: melanotan-ii
Overview
Melanotan II (MT-II) is a synthetic cyclic heptapeptide analogue of α-MSH, developed alongside PT-141 in the University of Arizona melanocortin program. It is a broad melanocortin-receptor agonist (MC1R/MC3R/MC4R/MC5R) whose two headline effects — tanning via melanogenesis and libido/erectile effects via central MC4R — made it the most notorious grey-market peptide of the last two decades. In 2026 it sells as 10 mg lyophilized vials (~$40–$45) from US, EU, and UK research vendors, plus nasal-spray formats (covered as a separate item). It has the strongest social pulse in this category track, but that pulse is polarized: viral safety warnings and enthusiastic user content coexist, and much of the loudest content is promotional or sponsored.
Social standing
Instagram: The dominant platform, and sharply divided.
- Paul Saladino, MD (2026-06-14): viral warning about Melanotan II safety; comments split hard between long-term users defending it and critics citing risks — the single most engaged MT-II discussion observed.
- Dr. Shereene Idriss (dermatologist, 2026-06-18): warning focused on atypical moles and unregulated peptides; comments mixed user defense and safety concern.
- Megyn Kelly / Gary Brecka (2026-07-16): highly promotional tanning discussion — treat as hype content, not evidence.
- A July 27, 2026 owner-style protocol update showed darkening, flushing, mole darkening, and random erections/libido effects — but carried a vendor discount code, marking it as sponsored rather than organic.
Threads: A May 18, 2026 user explicitly asked for Melanotan II experiences and got replies — genuine experience-seeking. A September 11 vendor-education post was also observed (vendor-adjacent, weak as validation).
Facebook: Tanning groups exist with real membership (TanToday Discussion Board and Information — 2,000 members; Tanning tips and facts — 4,000), and a generic tanning-injection experience request was observed in the latter — but it did not identify a specific compound, so it cannot be counted as MT-II validation. No verified MT-II-specific item discussion in the surveyed peptide groups.
Recurring praise: tanning without UV exposure ("works" is the near-universal claim); libido and spontaneous erections reported as a side benefit by male users; long history means deep community dosing lore.
Recurring complaints: nausea (especially at initiation), flushing, mole darkening and new/atypical moles (the most-cited safety worry, echoed by dermatologists), appetite suppression, uneven/patchy tanning, injection-site reactions; batch inconsistency from grey vendors.
Social validation
Tier: Tier 2 — the strongest social pulse in this track (Instagram owner/creator content + Threads experience-seeking), but no verified Facebook-group item discussion and heavy polarization/sponsorship contamination. Tier 1 withheld.
Named sources and what each proves:
- Instagram — Paul Saladino, MD (2026-06-14) — proves MT-II is culturally prominent enough to draw viral physician warnings and a large, divided comment section of self-identified users.
- Instagram — Dr. Shereene Idriss (2026-06-18) — proves dermatologist-level concern about atypical moles is circulating socially with user pushback.
- Threads user experience request (2026-05-18) — proves genuine prospective-user interest and reply-based experience sharing.
- Instagram owner-style protocol update (2026-07-27) — proves the effect profile users report (darkening, flushing, mole changes, libido) but is SPONSORED (vendor discount) — kept separate from organic evidence.
- Facebook "Tanning tips and facts" (4,000 members) — proves tanning-injection discussion exists at scale, but the observed thread did not name a compound.
Key specs table
| Spec | Detail |
|---|---|
| Identity | Melanotan II (MT-II), synthetic cyclic heptapeptide α-MSH analogue |
| Sequence | Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2 (as catalog-listed) |
| Formula / MW | C50H69N15O9 · ~1024.2 g/mol · CAS 121062-08-6 (as catalog-listed; primary-source verification not performed) |
| Target | Melanocortin receptors MC1R/MC3R/MC4R/MC5R (broad; tanning via MC1R, libido/erectile effects via central MC4R) |
| Vial sizes (grey market) | 10 mg lyophilized per vial (standard); nasal-spray formats covered separately |
| Half-life | Often cited ~33 h in vendor/community copy — UNVERIFIED; no primary pharmacokinetic source confirmed in this pass |
| Community-reported research use | Loading/titration lore is extensive in community spaces (start-low framing to manage nausea); specifics vary widely and are reported behavior only — not instructions. Mole monitoring is the most repeated community safety advice. |
| Storage | Lyophilized: −20 °C long-term (vendors also state RT stable ~90 days); reconstituted: 2–8 °C, use within ~30 days; avoid freeze–thaw |
Pricing
All prices observed 2026-09-20 from research-peptide vendor listings (grey market, research-use-only), 10 mg vials unless noted.
| Vendor | Price (10 mg vial) | Notes |
|---|---|---|
| Limitless BioChem | €32.00 | cheapest observed; EU |
| Protide Health | $40.00 | |
| Real Peptides | $40.00 | |
| Umbrella Labs | $40.99 | |
| Prime Lab Peptides | $45.00 | |
| Particle | €47.99 | EU |
| China wholesale price list | $40 per 10-vial box (10 mg/vial) | EXW supplier data, low confidence, not street pricing |
- Street range: roughly $40–$45 per 10 mg vial (US), €32–€48 (EU) — the tightest, most commoditized pricing in this track.
- Facebook Marketplace: not searched in this pass — used-value range UNVERIFIED.
What's included / what's needed
Vial listings ship the lyophilized 10 mg vial only (some vendors add a per-lot COA). Needed separately: bacteriostatic water, insulin syringes. Nasal-spray formats ship as finished bottles (separate item). No kit-style bundles observed as standard.
Support reality
No manufacturer warranty on research vials; vendor guarantees are vendor policies only. MT-II's decades-long grey-market history means vendor reputation lore is the deepest in the peptide space — but also the most astroturfed: sponsored "protocol update" content with vendor discount codes (observed July 2026) shows how commercial interests seed the discussion. No independent certification body exists; per-lot COAs remain the only quality instrument, and the community's standing advice is to demand them.
Community verdict
Melanotan II is the category's lightning rod: it has the most users, the most lore, the most dramatic before/after content — and the most polarized safety debate. The community consensus that does exist is narrow: it tans, it nauseates at first, it flushes, and moles change — that last point being the one even enthusiasts tell each other to watch. Everything else (long-term safety, batch quality, optimal protocols) is contested. It is the most socially visible item here, not the most socially validated.
Regulatory & safety status
- No FDA or EMA approval for Melanotan II for tanning, libido, or any human use. It is an unapproved research chemical everywhere identified in this pass.
- Multiple regulators (including the UK MHRA historically) have warned against "melanotan" tanning injections; these warnings generally do not distinguish MT-I from MT-II.
- Frequently cited risks: nausea/vomiting, flushing, blood-pressure effects, new or changing moles (melanocytic changes), priapism risk (prolonged erections), appetite suppression. The mole concern is the most medically substantive recurring signal (dermatologist warnings + user reports of darkening).
- Long-term safety data in self-administered use: UNVERIFIED — no controlled long-term data exists for this use pattern.
Image views
3 of 8 views obtained (vendor product images, JPEG; converted from PNG/WebP originals). Side-profile, top-angle, scale, box-accessories, and real-owner-in-use views were unavailable.
- hero:
img/melanotan-ii-hero.jpg(Imperium Peptides Melanotan-II 10 mg) - rear:
img/melanotan-ii-rear.jpg(Performance Clinics Research Sciences MT-II) - detail:
img/melanotan-ii-detail.jpg(Roidsgain Melanotan-2 10 mg) - side-profile: unavailable — candidate sources were hotlink-blocked or returned errors; alternatives exhausted
- top-angle: unavailable
- scale: unavailable — no vendor image with a size reference found
- box-accessories: unavailable
- real-owner-in-use: unavailable — no verifiable real-owner product photos found (IG content was reels/testimonials, not product photos)
Not medical advice. This is research documentation only. Melanotan II is not approved for human use anywhere; tanning injections carry documented risks including melanocytic changes. Consult a licensed healthcare provider.
Named sources
- Instagram — Paul Saladino, MD (2026-06-14) — proves MT-II is culturally prominent enough to draw viral physician warnings and a large, divided comment section of self-identified users. (2026-06-14)
- Instagram — Dr. Shereene Idriss (2026-06-18) — proves dermatologist-level concern about atypical moles is circulating socially with user pushback. (2026-06-18)
- Threads user experience request (2026-05-18) — proves genuine prospective-user interest and reply-based experience sharing. (2026-05-18)
- Instagram owner-style protocol update (2026-07-27) — proves the effect profile users report (darkening, flushing, mole changes, libido) but is SPONSORED (vendor discount) — kept separate from organic evidence. (2026-07-27)
- Facebook "Tanning tips and facts" (4,000 members) — proves tanning-injection discussion exists at scale, but the observed thread did not name a compound.
- MC1R — | Target | Melanocortin receptors MC1R/MC3R/MC4R/MC5R (broad; tanning via MC1R, libido/erectile effects via central MC4R) |
Source URLs were not recorded for these references.