FDA-APPROVED

Melanotan I (Afamelanotide / Scenesse)

FDA-approved as Scenesse for a rare painful light-sensitivity disease, and a real example of "the same name covering very different things." Don't confuse this with Melanotan II's tanning-peptide research-community history.

The 30-second read

Melanotan I, formal name afamelanotide, sold as Scenesse, is a 13-amino-acid synthetic analog of α-MSH (the body's natural pigmentation hormone). Developed by Clinuvel Pharmaceuticals, it's FDA-approved as of 2019 for adults with erythropoietic protoporphyria (EPP), a rare genetic condition that causes severe pain when affected people are exposed to light. Scenesse comes as a small subcutaneous implant placed by a physician every two months. It works by stimulating melanin production, which darkens the skin and provides photoprotection. It's not a tan-on-demand drug. It's not Melanotan II (which is the research-peptide tan compound that has documented safety concerns). The mainstream cosmetic-tan use case people sometimes assume is Scenesse-adjacent is mostly Melanotan II.

Why this peptide is on people's radar

The Melanotan I / Scenesse story is one of the cleaner drug-development success stories in the melanocortin space. Erythropoietic protoporphyria (EPP) is a rare genetic disease, about 1 in 75,000 to 200,000 people, where defective heme synthesis causes accumulation of protoporphyrin IX in red blood cells. When affected people are exposed to light, the protoporphyrin IX absorbs energy and causes severe burning, swelling, and pain in the skin, often within minutes. Sunlight, even through windows, can be debilitating. Before Scenesse, the only management was strict avoidance of light.

Scenesse activates the MC1R receptor on melanocytes, increasing the conversion of pheomelanin to eumelanin, the darker form of melanin that absorbs light more effectively. The result is increased photoprotection. EPP patients on Scenesse can spend more time in light and reduce phototoxic episodes. The drug was approved by the EMA in 2014 and the FDA in 2019, after a long Australian-led development program.

The off-label / research-peptide tan story is mostly about Melanotan II rather than Melanotan I. Melanotan II is a different molecule (a more selective MC1R agonist, but with broader off-target activity at other melanocortin receptors), and has documented safety issues including melanoma changes and priapism. We have a separate page for Melanotan II in our Tier 4 compliance-sensitive review. The Scenesse / Melanotan I story is genuinely separate and shouldn't be conflated.

What people are usually trying to do with it

Almost exclusively the FDA-approved use:

  • Reducing phototoxic episodes in adults with erythropoietic protoporphyria (EPP)
  • Increasing time in light for EPP patients
  • Improving quality of life in EPP, a very rare but profoundly limiting disease
  • Following melanocortin pharmacology for academic interest

What the science actually shows

Plain-English summary:

EPP photoprotection (FDA-approved use)

Phase 3 trials showed Scenesse increased pain-free sun exposure time and reduced phototoxic episodes in EPP patients. Basis of the FDA approval.1

Pigmentation effect

MC1R activation increases eumelanin production in melanocytes, producing visible skin darkening across body regions. The pigmentation is the protective mechanism, not the goal.2

Selectivity vs Melanotan II

Afamelanotide is more selective for MC1R than Melanotan II is. Melanotan II also activates MC3R and MC4R, which is the basis of Melanotan II's off-target effects (appetite, sexual response, cardiovascular).3

What hasn't been demonstrated

Approved tanning use. The drug's approved indication is photoprotection in a rare disease, not cosmetic tanning. Safety in long-term cosmetic-frequency use is uncharacterized, the approved protocol is bimonthly clinic implants in EPP patients.

The honest read

What's solid:

Scenesse is a real, fully-approved drug with rigorous Phase 3 evidence behind a meaningful indication. EPP patients have a meaningful quality-of-life option they didn't have before. Australia-based Clinuvel did the long development work to bring this through.

What's still being worked out:

Whether afamelanotide has utility in other photoprotection conditions (vitiligo, polymorphic light eruption, skin disorders involving photosensitivity). Clinuvel has explored these indications.

What's hyped beyond the evidence:

Treating Scenesse and Melanotan I generally as a cosmetic tanning option. The approved indication is photoprotection in a rare painful disease. The implant is administered bimonthly by a physician, costs thousands per implant, and is genuinely indicated only for EPP. Conflation with Melanotan II's research-peptide tan use case is a distinct mistake.

Things to know if you're looking into it

  • FDA-approved indication: erythropoietic protoporphyria in adults. Not approved for cosmetic tanning.
  • How it's administered: a small bioabsorbable implant placed subcutaneously by a physician every two months. Not self-injected.
  • Don't confuse with Melanotan II: different molecule, different selectivity profile, different regulatory and safety status. Melanotan II's research-peptide tanning use has documented safety concerns; Melanotan I's approved use is for a rare disease.
  • Common side effects from Scenesse Phase 3: nausea (especially with first treatments), facial flushing, fatigue, headache.
  • Healthcare provider involvement: required. Scenesse is administered exclusively in clinic by trained physicians.
  • Specific dosing protocols, mechanism, and the full reference list: all in the "Want to go deeper?" section below.

Reconstitution & dose reference

The FDA-approved product (Scenesse) is not user-reconstituted. Scenesse is a 16 mg pre-formed bioabsorbable implant placed under the skin by a physician every 2 months for adults with erythropoietic protoporphyria (EPP). The calculator below covers lyophilized research-peptide MT-1, which circulates outside the FDA-approved channel for off-label cosmetic use. Same molecule, different supply chain, vastly different quality control. EPP patients should not substitute research-peptide MT-1 for Scenesse — the implant is the validated delivery method for that indication.
Less safety-concerning than Melanotan II, but the standard melanocortin precautions still apply. MT-1 is more selective for MC1R (the pigmentation receptor) and produces less off-target activity at MC4R, which means less of the priapism, severe nausea, and blood-pressure swing risk that Melanotan II carries. The Scenesse Phase 3 program reported nausea (especially with first doses), facial flushing, fatigue, and headache as the most common side effects. Get a baseline full-body skin check from a dermatologist before any use. Any new or changing pigmented lesion warrants prompt dermatology evaluation — same melanoma-surveillance principle that applies across the melanocortin-agonist class. See the Melanotan II page for the safety contrast.
Community loading start
250 mcg/day
3–5 days to assess tolerance
Community loading range
500–1000 mcg/day
Daily until target pigmentation reached
Community max
1000 mcg/day
Above this, no clear added benefit
Maintenance
500–1000 mcg
1–2× weekly after loading
mL
Defaults to 5 mg/mL (2 mL into the 10 mg vial), the standard community reconstitution. Standard 250 mcg loading dose lands at 5 syringe units; 500 mcg at 10 units; 1000 mcg at 20 units. For better small-dose precision, reconstitute with 4 mL water (2.5 mg/mL) and the units roughly double.
mcg
Subcutaneous injection. Loading phase is daily for 4–6 weeks; maintenance is 1–2× weekly after target pigmentation develops. This is research-peptide community practice, not the FDA-approved Scenesse protocol (which is a 16 mg implant every 2 months, not self-injected). Inject in the evening after eating — nausea is the most common acute side effect across the melanocortin-agonist class.
Concentration
5.0 mg/mL
Per dose
0.05 mL
5 units on insulin syringe
Doses per vial
~40
~40 days (~5.7 weeks) of daily loading

When to stay put vs. adjust

Get a baseline full-body skin check from a dermatologist before any use. This applies to every melanocortin agonist that increases pigmentation. Photograph any concerning moles or lesions. Without baseline, you can't detect "new or changing" later, and pigmentation-shift detection is the single most important safety surveillance for this drug class.

Stay put at 250 mcg daily for the first 3–5 days to assess tolerance. The first doses are when nausea, facial flushing, and any unusual reactions are most likely. The Scenesse Phase 3 program reported these effects as common but typically transient and dose-dependent — starting low lets you confirm tolerance before scaling up.

Step to 500 mcg daily after the first week if 250 mcg was tolerated, then optionally 1000 mcg once tan begins to develop and you want a faster build. Pigmentation builds gradually over 2–6 weeks. Resist the urge to escalate just because results aren't visible immediately — that's the most common pattern that pushes users into unnecessary side effects.

Inject in the evening after a full meal. Nausea is the most-reported acute side effect across the melanocortin-agonist class, and empty-stomach injection makes it worse. Evening timing also lets you sleep through the worst of any first-dose response.

Move to maintenance at 4–6 weeks of loading. Once your target pigmentation is reached, switch to 500–1000 mcg 1–2× weekly to maintain. Continuing daily loading past the point pigmentation has plateaued doesn't add benefit and increases cumulative exposure.

Don't go above 1000 mcg per dose. Side effects scale faster than benefit at higher doses. The Scenesse 16 mg implant releases over ~60 days, which works out to roughly 270 mcg/day equivalent — community research-peptide doses well above 1 mg/day are pushing exposure beyond what the approved depot represents, without supporting evidence that the higher dose helps.

Watch for: any new or changing mole or pigmented lesion (stop and see a dermatologist), persistent severe nausea, facial flushing that doesn't settle within hours, or unusual fatigue. Most acute effects are mild and transient; persistence beyond the first week or two warrants a pause.

Hard contraindications: personal or strong family history of melanoma, history of significant skin cancers, any current pigmented lesion you haven't shown a dermatologist, pregnancy or trying to conceive, severe liver or kidney disease. EPP patients should be on Scenesse via the certified specialty channel, not on research-peptide MT-1.

The honest read. MT-1 sits in an unusual position on this site: the molecule is FDA-approved (as Scenesse for EPP), but the form most users are interacting with (lyophilized research-peptide vial for off-label cosmetic use) operates outside that approval. The clinical trial data for the molecule is real and the safety profile is meaningfully better-characterized than Melanotan II. But the research-peptide supply chain doesn't have the manufacturing oversight the approved product does, and the off-label cosmetic use isn't the indication the trials validated. If you have EPP, get Scenesse through a certified specialty center — the implant is the validated delivery and the supply chain is regulated. If you're using research-peptide MT-1 cosmetically, you're using a chemical relative of an approved drug obtained outside that approval channel; the molecule's safety record is favorable but the supply quality is not the same as the approved product.

For educational and research purposes only. This is not medical advice. The FDA-approved form of this molecule is Scenesse® (afamelanotide), a physician-placed implant for erythropoietic protoporphyria. Research-peptide lyophilized MT-1 operates outside that approval channel. Cosmetic use is off-label and not the indication the FDA approval covers. Establish a baseline full-body skin check with a dermatologist before any use. Consult a licensed healthcare provider before any health decision.

What people often ask

Is this the tanning peptide?

No. The tanning-peptide story usually refers to Melanotan II, a different molecule with broader receptor activity and documented safety concerns. Scenesse / Melanotan I is FDA-approved for a rare painful photosensitivity disease and is not used or approved for cosmetic tanning.

Is Scenesse FDA-approved?

Yes, for adults with erythropoietic protoporphyria. Approved 2019 by the FDA, earlier in the EU.

How is it different from Melanotan II?

Melanotan I (afamelanotide) is more selective for the MC1R receptor that drives skin pigmentation. Melanotan II also strongly activates MC3R and MC4R, which are involved in appetite, sexual response, and cardiovascular function, the basis of Melanotan II's reported side effects.

Does it work for vitiligo?

Has been studied off-label for vitiligo and other pigmentation disorders. Clinical evidence is limited and not the basis of the FDA approval.

What does an EPP treatment look like?

A small implant the size of a rice grain is inserted subcutaneously by a physician. The implant slowly releases afamelanotide over about two months, then dissolves. Patients typically receive three implants per year, timed to high-light seasons.

FDA and regulatory status

Status as of May 5, 2026: FDA-approved as Scenesse (October 2019) for adults with erythropoietic protoporphyria. Approved by the EMA in 2014 for the same indication. Manufactured by Clinuvel Pharmaceuticals. Status updates land here when they happen.

Want to go deeper? Mechanism, the Phase 3 program, dosing, and references.

Background

Afamelanotide is a 13-amino-acid synthetic analog of α-melanocyte-stimulating hormone (α-MSH) with substitutions that confer enhanced potency and metabolic stability versus native α-MSH. Developed by Clinuvel Pharmaceuticals over multi-decade clinical development. EMA approval 2014, FDA approval October 2019.

Mechanism of action

Afamelanotide is a selective MC1R agonist. MC1R activation on melanocytes increases tyrosinase activity and shifts the melanin synthesis pathway toward eumelanin (the darker, more photoprotective form). The increased eumelanin in skin provides better absorption of light energy, reducing phototoxic damage in EPP.

FDA-approved dosing

16 mg subcutaneous implant placed by a healthcare professional every 2 months during periods of light exposure. Implant slowly releases over ~60 days, then bioabsorbs.

References

  1. Langendonk JG, Balwani M, Anderson KE, et al. (2015). "Afamelanotide for erythropoietic protoporphyria." N Engl J Med, 373(1), 48–59. PubMed
  2. Lim HW, Grimes PE, Agbai O, et al. (2015). "Afamelanotide and narrowband UV-B phototherapy for the treatment of vitiligo: a randomized multicenter trial." JAMA Dermatol, 151(1), 42–50. PubMed
  3. Hadley ME, Dorr RT. (2006). "Melanocortin peptide therapeutics: historical milestones, clinical studies and commercialization." Peptides, 27(4), 921–930. PubMed
  4. U.S. Food and Drug Administration. "Scenesse Prescribing Information." FDA.gov
For educational and research purposes only. This is not medical advice. Scenesse is FDA-approved exclusively for adults with erythropoietic protoporphyria. Do not confuse with Melanotan II. PeptideLibraryHub is independent and does not sell peptides or accept money from anyone who does.