Melanotan I

What Melanotan I is

Melanotan I is a linear analogue of alpha-MSH (alpha-melanocyte-stimulating hormone), the melanin pathway compound studied in the afamelanotide drug programme. It is the earlier of the two melanotan analogues and the one with the most developed clinical research history; it acts principally through the MC1R receptor, the one linked to melanin production.

Where it sits in the skin, hair & tan category

On the shelf it sits with the other melanocortin and melanin-pathway research compounds. The Melanotan hub compares the I and II analogues directly; Melanotan II is the cyclic counterpart with a broader receptor profile. GHK-Cu and Snap-8 cover the collagen and texture research side of the same category.

Melanotan I vs Melanotan II vs tanning spray

The comparison UK buyers actually search for is not compound-versus-compound but research peptide versus cosmetic tanning product — two entirely different categories that share a language. A tanning spray is a topical cosmetic that deposits or stimulates pigment at the skin surface; a melanocortin research peptide is a laboratory material studied for its action on the melanin pathway from within. They are not substitutes for one another and they are not regulated the same way, which is the source of most of the confusion in this category.

The practical consequence: a spray can be treated as a cosmetic purchase, whereas a research peptide is a laboratory material with a COA, a purity specification and a handling standard. Reading one as though it were the other is where most of the category's misinformation comes from.

What the evidence covers, and where it stops

Melanotan I has the more developed clinical history of the two melanotan analogues because it is the backbone of the afamelanotide drug programme — the linear analogue has been studied in a formal development pathway, which is why it is the one with an approved-product lineage. The pigmentation mechanism itself is well characterised: melanocortin receptor agonism drives the melanogenesis pathway and increases pigment production.

What the literature does not provide is a case for casual use. Pigmentation findings come from small studies and from supervised drug-development work, and reported effects include nausea, injection-site reactions, and darkening of existing moles and freckles. That last one is the signal worth holding on to: any change in an existing mole or freckle is a reason to seek proper assessment rather than to assume it is the compound working. Demand for this category is strongly seasonal, spiking through spring and summer, which tells you more about consumer behaviour than about evidence.

How it is supplied & handled

Melanotan I is stocked in a single 10mg presentation as a lyophilised (freeze-dried) powder in a sealed vial, which is the format that keeps a peptide stable for storage. Handling follows the same standard as any research peptide: keep the lyophilised vial cool, dark and dry before use, and reconstitute with bacteriostatic water when ready. Our reconstitution guide covers the general method, and every batch ships with a certificate of analysis available on request — see the lab & COA policy.

Ordering, payment & delivery

Pricing is per single vial — no minimum order, so you can order one vial or twenty. Card checkout runs through Stripe using the button on this page; bank transfer is priced 10% lower and the order confirms on clearance. Orders dispatch from the UK with cold-chain handling. Full timelines and payment details are on the delivery & payment page, and any question can go to us via contact.

Frequently asked questions