Melanotan 2 (MT-II) is a synthetic peptide often called the "tanning peptide." This overview explains what the molecule is, how Melanotan 2 works, which forms exist (injections and spray), and what dosing the research literature actually describes. It is educational content written for a research-use context, not medical advice.
What Melanotan 2 is
MT-II is a shortened synthetic analog of the natural hormone α-MSH (alpha-melanocyte-stimulating hormone). It was developed back in the 1980s at the University of Arizona while researchers looked for a way to stimulate pigment production without direct ultraviolet exposure. Unlike the first "melanotan" (Melanotan I / afamelanotide), the second version acts on a broader set of melanocortin receptors, which is why studies recorded effects beyond pigmentation.
Important: Melanotan 2 is not an approved drug in Ukraine or the EU. In many jurisdictions it circulates strictly as a research compound (research use only), not as a cosmetic or medical product.
How Melanotan 2 works
The mechanism comes down to melanocortin-receptor agonism. The one that matters for tanning is MC1R on skin melanocytes: when the peptide activates it, the cells synthesize more eumelanin, the dark pigment that gives skin its shade. In plain terms, MT-II mimics the signal that ultraviolet light normally triggers, so studies observed skin darkening even with less sun exposure.
Because MT-II is non-selective, it also hits other receptors in the family (MC3R, MC4R). Activation of MC4R is what research linked to side effects such as nausea, reduced appetite, and effects on libido. As an aside, a separate branch of that research later led to bremelanotide (PT-141), a melanocortin molecule in its own right.
Forms: injections and spray
In research circulation, MT-II most often appears as a lyophilized powder in a vial that is reconstituted with bacteriostatic water before use. This is the subcutaneous format and the main form used in protocols.
Nasal spray
The "melanotan 2 spray" query is popular because the nasal form looks more convenient than injections. The catch: the peptide absorbs poorly and unpredictably across the nasal mucosa, so the amount of active compound that actually reaches the bloodstream varies a lot. In a research context the spray is treated as a less reproducible format, and homemade nasal solutions of unknown purity are a separate risk. For any sound experiment, two things are non-negotiable: a known concentration and confirmed purity of the active compound.
Dosing in the research
There is no standardized "correct" Melanotan 2 dose: it is not a registered drug, so no official directions for use exist. Scientific and veterinary-research literature describes subcutaneous administration of small amounts with a gradual ramp toward a target level, but those figures apply to controlled experiments, not to people dosing themselves.
We deliberately do not give specific "how much to inject" schemes: that would step outside educational content and research use. The key takeaway from any dosing discussion is that individual response varies widely, and a miscalculation when converting the concentration of reconstituted powder easily produces a manyfold overshoot of the intended amount.
Risks worth knowing
Case reports and observational series with MT-II have described nausea, flushing, darkening of moles, and the appearance of new pigmented lesions. That last point matters: dermatologists stress that uncontrolled melanocyte stimulation complicates skin monitoring and can mask concerning changes. This is part of why many countries restrict retail sale of MT-II.
Where Longeva stands: purity you can verify
Longeva does not sell Melanotan 2. This overview is purely educational. Our approach is different: we work with research peptides where every batch ships with a certificate of analysis (COA), so purity is something you verify rather than take on faith. If the topic of research peptides interests you, browse the catalog of certified research peptides from Longeva, where every item comes with batch documentation.
Bottom line: Melanotan 2 is a scientifically interesting melanocortin molecule surrounded by plenty of "perfect tan" myths and very little standardization. For any research, two things stay decisive: a known concentration and confirmed reagent purity.