Melanotan usually means unapproved synthetic peptides sold for tanning, most often melanotan I or II. They are not FDA-approved for consumer use, and case reports describe serious adverse events.

Research peptidesmelanotan

Melanotan: Dosage, Side Effects and Legal Status

Melanotan tanning peptides explained: reported dosing, the case reports of serious harm, and why these products are not FDA-approved.

Written bySebastian Hunter, Founder and EditorI'm a 42-year-old senior advisor and distance runner who came to peptides as a sceptic. I'm not a doctor: I read the research, run my own experiment and keep honest notes. Read full bio

Published July 16, 2026Updated October 3, 2026

The short version

Melanotan products are unapproved tanning peptides. Melanotan II does darken skin, but its published human record is mostly case reports of serious harm, not efficacy studies. This page is a safety read, not a how-to.

Not approved cosmetics or medicines for tanning.
Published cases describe serious harms.
I do not treat this as a lifestyle shortcut.

Melanotan II at a glance

What it is: Synthetic cyclic heptapeptide
Main use: Marketed to consumers as a tanning aid, sold unapproved and outside any FDA-cleared indication.
Also called: Melanotan-II, MT-II, Melanotan
Molecular formula: C50H69N15O9 (1024.2 g/mol) Structure
Evidence: Limited human data
US status: Research use only
Australia: Not on the ARTG
Half-life: Not established in humans
How it is taken: Subcutaneous injection
Common protocol: 100-1000 mcg, daily loading dose of 100-1000 mcg for several weeks, then 250-1000 mcg 1-3 times a week for maintenance, for 4-8 weeks (common practice, not trial-established) Dosage chart

Melanotan shows up in searches next to “safe tan” and “peptide nasal spray.” The appeal is real: melanotan II does darken skin. In the one published pilot study, 2 of 3 men given it had measurably darker skin a week after dosing ended (Dorr 1996 - Dorr RT, Lines R, Levine N et al. Evaluation of melanotan-II, a superpotent cyclic melanotropic peptide in a pilot phase-I clinical study. Life Sci. 1996;58(20):1777-84., in the references below).

A close relative, afamelanotide, went through proper trials and is approved for a few medical uses (Habbema 2017 - Habbema L, Halk AB, Neumann M et al. Risks of unregulated use of alpha-melanocyte-stimulating hormone analogues: a review. Int J Dermatol. 2017;56(10):975-980., in the references below). The products sold online have had no controlled safety testing, and their published human record is mostly case reports of harm. This page is weighted that way because the evidence is.

Melanotan I is afamelanotide; its approved implant, label dose and differences from Melanotan II are on the Melanotan 1 page.

Dosing: what the one published trial used.

What is melanotan?

“Melanotan” usually means unapproved synthetic peptides, most often melanotan I or II, sold for tanning or related effects. They are not an FDA-approved over-the-counter tan.

Melanotan II structure

2D chemical structure of Melanotan II, C50H69N15O9 — 2D structure from PubChem CID 92432 (NCBI, public domain). Open it in PubChem to zoom or view in 3D.

Molecular formula: C₅₀H₆₉N₁₅O₉
Molecular weight: 1024.2 g/mol
Length: 7 amino acids
Sequence: XDHFRWK
Modifications: N-terminal acetyl on X1 = norleucine (Nle); D-Phe4; cyclic: lactam bond between the Asp2 and Lys7 side chains; C-terminal amide.
PubChem CID: 92432

Melanotan II differs from afamelanotide (melanotan I, a linear 13-residue peptide) and from bremelanotide (PT-141), which is the same ring with a C-terminal acid instead of the amide.

Identity checked against FDA Global Substance Registration System (UNII UPF5CJ93X7).

What people who use it report

Use is common enough that regulators are chasing it. In January 2025, ABC News in Australia reported that dozens of websites still sold tanning nasal sprays. The TGA had issued 4,800 enforcement notices in a year against websites selling illegal products, nasal tanning sprays among them.

What users describe:

A tan they couldn’t get otherwise. In a 2018 survey of 21 users from an online melanotan forum, many said it made them feel more attractive and improved their quality of life. Some used it to avoid sunburn, and 93% of current users planned to keep going (Callaghan 2018 - Callaghan Iii DJ. A glimpse into the underground market of melanotan. Dermatol Online J. 2018;24(5)., in the references below). A young woman interviewed by ABC News said it let her tan rather than just burn. An in-depth case study of one user describes the same boost in confidence (Van 2014 - Van Hout MC, Brennan R. An in-depth case examination of an exotic dancer's experience of melanotan. Int J Drug Policy. 2014;25(3):444-50., in the references below).
Nausea, flushing and appetite changes. In the same survey, the most common side effects were nausea, flushing, reduced appetite and drowsiness. The case-study user avoided nausea by injecting before sleep and described building tolerance. The ABC interviewee reported facial flushing, acne and more freckles.
Moles and other worries. A study of 623 posts by 205 people on UK and Irish forums found side effects among the recurring themes (Gilhooley 2021 - Gilhooley E, Daly S, McKenna D. Melanotan II User Experience: A Qualitative Study of Online Discussion Forums. Dermatology. 2021;237(6):995-999., in the references below). The authors flag infection risk, possibly contaminated products, mixing with other drugs and heavy sunbed use. Dermatologists report changed and new moles (see side effects below).

Self-reports can’t separate the drug from placebo, sunbed use or other changes people made. A satisfied forum member is not a safety record, which is why the lack of any controlled safety trial matters.

Melanotan dosage

The common Melanotan II dose is 100-1000 mcg, daily loading dose of 100-1000 mcg for several weeks, then 250-1000 mcg 1-3 times a week for maintenance. From a 10 mg vial mixed with 2 mL of bacteriostatic water, 550 mcg is 11 units (0.11 mL) on a U-100 insulin syringe.

See the full Melanotan II dosage chart →

For Melanotan II, dosing guides and user communities describe a common protocol:

Loading: 100-1000 mcg injected under the skin daily for 4-8 weeks to build colour.
Maintenance: 250-1000 mcg 1-3 times a week.
Break: roughly 4-6 weeks.

That is common practice, not a dose any trial or regulator has set. The only published human trial data is a 1996 pilot study in 3 men. The Melanotan 2 dosage page covers that trial dose and a published overdose case.

Melanotan side effects

The evidence here is published case reports, not controlled safety trials.

Reported in studies

Priapism (a prolonged, painful erection) linked to melanotan use Dreyer 2019 - Dreyer BA, Amer T, Fraser M. Melanotan-induced priapism: a hard-earned tan. BMJ Case Rep. 2019;12(2)., in the references below
Renal infarction (loss of blood supply to part of a kidney) discussed in connection with melanotan II Peters 2020 - Peters B, Hadimeri H, Wahlberg R et al. Melanotan II: a possible cause of renal infarction: review of the literature and case report. CEN Case Rep. 2020;9(2):159-161., in the references below
Rhabdomyolysis and whole-body toxicity after a single 6 mg overdose injection, in a separate case report. See Melanotan 2 overdose for that case.
Changes in moles and melanoma. A dermatology review describes growing numbers of case reports of changed moles and new, sometimes abnormal (dysplastic), moles in users. It also lists four cases of melanoma arising from existing moles during or shortly after use. The authors note there is no conclusive evidence of cause Habbema 2017 - Habbema L, Halk AB, Neumann M et al. Risks of unregulated use of alpha-melanocyte-stimulating hormone analogues: a review. Int J Dermatol. 2017;56(10):975-980., in the references below.

These are serious events, not a mild side-effect profile.

Limited human data

Small or uncontrolled human studies. Too little to settle the question either way. Case reports of serious adverse events, not a body of high-quality trials showing consumer tanning use is safe. Unapproved marketing is not a safety programme.

For injection-site reactions, see peptide injection site reactions. Get emergency care for an erection lasting more than 4 hours, severe muscle pain, dark urine, or any symptom that feels dangerous.

Is melanotan legal?

Melanotan products are research / unapproved products. They are not cosmetics, and they are not approved prescription medicines with a labelled risk-benefit for tanning. The FDA has not approved them for the consumer uses people seek online.

Regulatory changes for this compound and others, as they happen: US peptide regulation tracker.

How Melanotan II compares

Melanocortin peptides. Doses for unapproved compounds are common practice, not trial-established. All hormones and sexual health peptides →

Compound	Main use	Evidence	Usual dose	US status
PT-141	Approved for premenopausal women with acquired, generalised hypoactive sexual desire disorder. Sold in grey channels predominantly to men.	Strong human evidence	FDA label	FDA-approved · prescription only
Melanotan II	Marketed to consumers as a tanning aid, sold unapproved and outside any FDA-cleared indication.	Limited human data	100-1000 mcg, daily loading dose of 100-1000 mcg for several weeks, then 250-1000 mcg 1-3 times a week for maintenance	Research use only

Where to buy Melanotan II for research

Each vendor is checked against my vendor checklist.

1.Next Level PharmFeatured
10 mg vial
- No FDA warning letter found
- Names its testing lab
- Batch COAs published
- Takes card payment
$24.99as of 3 October 2026
View product →My Next Level Pharm review
2.BioEdge Research Labs
10 mg vial
- No FDA warning letter found
- Names its testing lab
- Batch COAs published
$39.00as of 3 October 2026
View product →My BioEdge Research Labs review

Compare every checked vendor for Melanotan II →

See all vendors and how they compare →

Common questions

Is melanotan safe?

Published case reports link melanotan products with serious events, including priapism and renal infarction. That is not a harmless cosmetic profile. This is not personal medical advice.

Is melanotan legal in the US?

The FDA has not approved these products for the consumer uses people seek online. Selling and marketing unapproved drugs can break federal law. This is not legal advice.

What is the usual melanotan dose?

For Melanotan II, dosing guides and user communities describe 100-1000 mcg injected under the skin daily for 4-8 weeks, then 250-1000 mcg 1-3 times a week to maintain it. That is common practice, not an established dose. The Melanotan 2 dosage page has the one published human trial dose and an overdose case.

What are the side effects of melanotan?

Published case reports describe serious events, including priapism and renal infarction. Another describes rhabdomyolysis and whole-body toxicity after a single large injection. These are case reports, not a controlled safety trial, but they are far from a harmless cosmetic profile.

How long does Melanotan 2 take to tan?

No trial has set a timeline. In a pilot study, 3 healthy men had injections every other day for 2 weeks, and 2 had measurably darker skin a week after dosing ended. User protocols describe a daily loading phase of 4-8 weeks. That is common practice, not a tested regimen or evidence of safety.

Is Melanotan 2 hard on the kidneys?

There are case reports of kidney harm. In one, the authors judged a renal infarction (loss of blood supply to part of a kidney) most likely caused by melanotan II. A separate overdose case describes rhabdomyolysis with reduced kidney function. I found no controlled study of kidney safety, so the size of the risk is unknown.

Does Melanotan 2 burn fat?

I found no published study showing that it does, and it is not approved for weight loss. In small early studies in men, reduced appetite was reported more often than on placebo. That was recorded as a side effect, not evidence of fat loss.

Does Melanotan 2 affect the heart?

The evidence is one case report. A man who injected 6 mg of melanotan II bought online developed a racing heart (up to 146 beats per minute), tremor, sweating and anxiety, then rhabdomyolysis, and spent 3 days in intensive care. I found no controlled study of its effects on the heart. Get urgent care for chest pain or a racing heart.

References (11 sources)

Bibliographic detail is fetched from PubMed, not written by me - so a citation here cannot drift from the paper it names. Study design comes from PubMed's own tags rather than my judgement.