Melanotan II nasal spray: tanning hack or serious gamble?

What did @stanmilsom1 actually say?

The creator laid out a two-phase protocol for melanotan II (MT2) nasal spray: a "loading phase" of "three to four sprays daily" paired with UV exposure, followed by a maintenance phase of roughly one spray per nostril, three to five times a week. The goal, in their words, is to "get a nice bit of a base tan going on" and then hold that colour over time.

To be clear, this is unsolicited dosing guidance for an unlicensed peptide being sold informally. The creator is not a clinician. They are describing personal use in a casual, first-person style, which does not make it medical advice, but does make it influential given 124,500 views.

Does the science back this up?

Partly, but with serious caveats the video skips entirely. The mechanism is real: MT2 (melanotan II) is a synthetic analogue of alpha-melanocyte-stimulating hormone (alpha-MSH) that binds melanocortin receptors, particularly MC1R, to stimulate melanogenesis. UV exposure does potentiate the effect.

A 1998 study by Dorr et al. published in the Journal of Clinical Endocrinology and Metabolism confirmed that melanotan II increases pigmentation and that UV light enhances that response. So the creator is not inventing the biology. However, the same study documented a significant side-effect profile including nausea, facial flushing, spontaneous erections, and fatigue, none of which gets a single mention in this video. A 2021 review by Lim et al. in British Journal of Dermatology flagged case reports of melanoma change in existing nevi associated with melanotan use, which is arguably the most important thing anyone considering this peptide should know.

What did they get wrong (or right)?

Credit where it is due: the phased approach, loading then maintenance, loosely mirrors how some researchers have structured melanotan II administration, and the logic of needing UV activation is mechanistically sound. The creator is not completely fabricating things.

What they got wrong is everything they left out. Nasal bioavailability of peptides like MT2 is inconsistent and poorly characterised compared to subcutaneous injection, the route used in most clinical studies. Advising "a couple of sunbeds" as UV activation is particularly reckless given that the WHO classified tanning beds as Group 1 carcinogens in 2009 (Boniol et al., BMJ, 2012). Combining an unregulated melanocortin agonist with UV exposure from a tanning bed is not an optimisation protocol. It is layering two separate skin cancer risk factors on top of each other. The video also gives no acknowledgement that MT2 is not approved by the FDA, MHRA, or EMA, and is not legal for human use in many jurisdictions.

What should you actually know?

MT2 is a research peptide with real pharmacological activity, not a supplement. That means real effects and real risks. The spontaneous erection side effect alone has been documented repeatedly in the literature, including by Wessells et al. in a 1998 Urology study. There are also documented cases of hypertension, rhabdomyolysis, and concerning mole changes in users.

Nasal spray formulations add another layer of uncertainty. Most of the published human data on MT2 used subcutaneous delivery. Transmucosal absorption through the nasal mucosa varies based on formulation, pH, and individual anatomy. Dose consistency from a nasal spray is simply not the same as from a measured injection, which means the "loading phase" arithmetic the creator describes is not reliably transferable from person to person.

• MT2 is not approved for cosmetic or medical use in the UK, US, EU, or Australia.
• Combining MT2 with tanning bed UV is not supported by any clinical safety data.
• Anyone noticing mole changes while using melanotan products should see a dermatologist promptly.
• Nasal bioavailability data for MT2 specifically is limited and not well validated in peer-reviewed literature.