Melanotan I Testing & Verification
Independent, third-party analysis of mail-in Melanotan I samples by RP-HPLC-UV — confirming the vial holds MT-I rather than MT-II, how pure it is, and how much peptide is actually present, all against a certified reference standard.
What Melanotan I is
Melanotan I, also known as afamelanotide or MT-I, is a synthetic linear 13-amino-acid analog of alpha-melanocyte-stimulating hormone (alpha-MSH). It keeps the full-length alpha-MSH backbone but carries two stabilizing substitutions: norleucine at position 4 (Nle4) and D-phenylalanine at position 7 (D-Phe7). It is a chemically distinct molecule from Melanotan II, which is a shorter, cyclic analog — the two are not interchangeable names for the same compound, though grey-market listings routinely blur them. Analytically, MT-I is a friendly molecule: it contains both tryptophan and tyrosine residues, giving it a strong and characteristic UV absorbance profile on a diode-array detector. Material sold on the research-chemical market carries no regulated identity or content guarantee, which is exactly what independent testing addresses.
Why get your Melanotan I independently tested
- MT-I vs. MT-II substitution: this is the single biggest identity question for this compound. Melanotan II is a shorter, cyclic molecule with different chromatographic behavior, and vials are routinely mislabeled or swapped between the two names. A retention-time and UV-spectral match against a certified Melanotan I reference standard directly answers whether the vial holds the linear 13-residue MT-I or something else.
- Underfill and label mass vs. true peptide mass: lyophilized MT-I is typically an acetate salt with counter-ion and excipient weight included in the powder. A net-peptide assay reports the actual milligrams of peptide per vial, so the labeled 10 mg can be checked against what is measurably peptide.
- Synthesis by-products: a 13-residue synthesis with a D-amino-acid coupling and a norleucine substitution leaves room for deletion sequences, incomplete acetylation, and epimerized (wrong-stereochemistry) by-products that travel with the product. Chromatographic purity as area percent quantifies how much of the UV-absorbing material is the main peak versus these related impurities.
- Degradation on storage and reconstitution: the tryptophan and methionine-like Nle-adjacent chemistry of melanocortin analogs can show oxidation and other breakdown peaks after heat, light, or time in solution. Comparing your sample's impurity profile against a fresh certified standard shows whether degradation peaks have grown.
What we measure on Melanotan I
Every Melanotan I certificate reports three results by reversed-phase HPLC with UV/diode-array detection. Identity is established by matching your sample's retention time and UV spectrum against a certified Melanotan I reference standard — MT-I's tryptophan and tyrosine content gives it a distinctive spectral fingerprint that supports this comparison. Chromatographic purity is reported as the area percent of the main peak relative to total integrated peak area, and the net-peptide assay reports the milligrams of peptide actually present per vial for comparison against the label.
Every result is issued as a certificate of analysis you — or anyone you forward it to — can verify cryptographically. Reporting identity, purity, and milligram content is the point: a vial can be pure and still underfilled, so we report all three. More on purity vs. net-peptide content and how to read a peptide COA.
Our scope — stated plainly
Testing is RP-HPLC-UV against a certified Melanotan I reference standard. Identity is a retention-time and UV-spectral match, not a mass-spectrometry sequence confirmation. KMD Analytical is an independent laboratory; we do not perform mass spectrometry, sterility, endotoxin, heavy-metal, or residual-solvent testing.
KMD is an independent RP-HPLC-UV lab. We do not run LC-MS / mass-spec, sterility, endotoxin, or heavy-metal testing. If your job needs a capability we don't have, we'll say so.
Melanotan I testing — FAQ
Can you tell Melanotan I apart from Melanotan II?
Yes — that is the main reason to test this compound. MT-I is a linear 13-residue peptide and MT-II is a shorter cyclic analog; they are different molecules with different retention times and UV spectra under our method. By running your sample against a certified Melanotan I reference standard, we can report whether the material matches MT-I or fails the identity comparison. Keep in mind this is a chromatographic and spectral match, not mass-spectrometry sequencing.
My vial just says 'Melanotan' — which standard will you test it against?
Tell us what the vendor claimed when you place the order. If the label says Melanotan I (or afamelanotide), we compare against the MT-I standard; if the result does not match, the certificate reports the non-conforming identity result. If you genuinely do not know which one you have, mention it — an identity comparison is only meaningful against a stated claim.
Does the net-peptide number tell me if my 10 mg vial really has 10 mg?
It tells you the milligrams of peptide measured in the vial you send, which you can compare directly against the labeled amount. It specifically excludes counter-ion (acetate), water, and excipient mass, which is why the net-peptide figure is often lower than the gross powder weight even in honestly filled vials.
Do you sell Melanotan I or judge whether it is safe to use?
Neither. KMD Analytical is an independent testing laboratory: we do not sell peptides, and a certificate is an analytical characterization of the sample you mail in — identity, chromatographic purity, and net-peptide content — not a safety, sterility, or fitness-for-use determination.
Other peptides we test
Retatrutide · Cagrilintide · Tesamorelin · BPC-157 · see the full panel.