Melanotan 2 is a synthetic melanocortin agonist studied for pigmentation — and recorded, in the literature, for changing moles.

The short version

Melanotan 2 is a man-made copy, with a few deliberate changes, of a natural hormone that tells skin cells to make more pigment. Injected under the skin, it darkens skin and hair without sunlight, and in the small studies that exist it also caused spontaneous erections in men and dulled the appetite. People mostly seek it out for a fast, deep tan.

Here is the part this site leads with. Because the compound switches on the cells that make pigment, doctors have published reports of moles darkening, brand-new moles appearing, and — in a handful of cases — melanoma (a serious skin cancer) showing up in people who used it. It is not approved as a medicine or a cosmetic anywhere, and the products sold online are unregulated. What people report, including the downsides, is on the effects page. Nothing here is medical or dosing advice.

What the Melanotan 2 literature actually records

Melanotan 2 (Melanotan II, MT-2, MT-II) is a cyclic synthetic analog of alpha-melanocyte-stimulating hormone (alpha-MSH) — the body's own pigment-signaling peptide. It was designed in the late 1980s at the University of Arizona by Hruby and Hadley as a more potent, longer-lasting version of that hormone, and the first pilot study in three healthy men confirmed it could darken skin after only five low subcutaneous doses, without any ultraviolet exposure ^[1].

The finding that gave the compound its reputation also came early: the same pilot reported spontaneous, prolonged erections in the male volunteers ^[1], a melanocortin effect later confirmed in a controlled crossover study of men with erectile dysfunction ^[2]. From that observation a separate, narrower analog — bremelanotide — was developed and eventually approved for a sexual-desire indication ^[3]. The pigment-and-erection lineage is the story of this molecule, and it is why the same peptide is discussed under headings as different as tanning, appetite, and sexual function.

What sets this particular digest apart is the mole question. As a non-selective melanocortin agonist, Melanotan 2 stimulates pigment cells (melanocytes) across the whole skin — not only to make a tan, but to alter existing nevi. Dermatology case reports document moles darkening, eruptive new nevi appearing, dysplastic (architecturally abnormal) nevi, and a small number of melanomas in users ^[4][5][6][7]. That is the thread the rest of this site follows.

What people actually use it for

Search interest is large — roughly 18,100 queries a month for the term Melanotan 2 — and the motivation behind most of it is cosmetic: a faster, deeper tan reached with far less sun or sunbed time. Users describe noticeable darkening within days. The appetite suppression and the libido effects are treated, depending on the person, as a welcome bonus or an off-putting nuisance.

The controlled human evidence behind any of this is thin. It amounts to small Phase I studies of three to twenty subjects on pigmentation and on erectile function ^[1][2]. No Phase II or Phase III trial of Melanotan 2 has ever been completed, and it holds no approved indication in any country. An honest account of the Melanotan 2 effects has to keep that proportion: large reported effects, small formal evidence, and a documented safety tail that includes the moles this site is concerned with.

What this site is — and is not

This is an editorial digest of the peer-reviewed literature on Melanotan 2. It is not a clinic, not a vendor, and not a tanning service. It does not provide medical advice, it does not recommend a dose, and it does not sell or endorse the compound.

The research is organized across a few pages. The Melanotan 2 research page covers the mechanism and the key studies. The dosage page describes, in research terms only, the doses that have been administered to specific species in published work — never as instructions. The dedicated melanotan 2 dangers and melanotan 2 side effects pages collect the documented harms, with the mole and melanoma reports front and center. Every figure traces to a numbered source in the Melanotan 2 references.