Melanotan I (MT-1) — Certificate of Analysis

Lot MT1-2026-001 of Melanotan I assayed at 99.80% peptide purity by RP-HPLC against a ≥95.0% release specification, 4.80 percentage points clear of it. Released 07/15/2026 by ILS Laboratories, ISO/IEC 17025 Accredited. Linear 13-residue alpha-MSH analog ([Nle4-D-Phe7]-alpha-MSH) studied in pigmentation and melanocortin-receptor research.

Net peptide content measured 10.65 mg against a 10 mg label — the mass of actual peptide in the vial, as distinct from salts, water and counter-ions. It is reported rather than graded, so it carries no pass/fail.

Full QC panel

Analyte	Specification	Result	Status
Peptide Purity (HPLC)	≥ 95.0%	99.80%	Pass
Identity (HPLC-RTM)	Melanotan I Confirmed	Confirmed	Pass
Net Peptide Content	Report Only	10.65 mg	—
Fentanyl Screen	Immunoassay, 50 ng/mL cutoff	Not Detected	Pass

Sterility & endotoxin

Test	Specification	Result	Status
Sterility (PCR)	No Growth	No Growth	Pass
Endotoxin (USP <85>)	Report Result	NMT 0.05 EU/mL	Reported

Endotoxin is reported as a measured value rather than graded pass/fail: acceptable limits depend on route and matrix, and no universal threshold applies to research-use material. The laboratory reports the figure and leaves the judgement to you.

Elemental impurities

Panel	Method	Result	Status
Arsenic, cadmium, chromium, lead, mercury	ICP-MS, USP <233>	5 of 5 under limit	Pass

Per-element measurements are on the signed certificate below.

Reference data

Property	Value
Compound	Melanotan I (MT-1)
Also known as	Melanotan, Melanotan-1, [Nle4-D-Phe7]-alpha-MSH, NDP-alpha-MSH
Sequence	Ac-Ser-Tyr-Ser-Nle-Glu-His-D-Phe-Arg-Trp-Gly-Lys-Pro-Val-NH2
Molecular formula	C78H111N21O19S
Molecular weight	1646.9 g/mol
CAS number	75921-69-6
Physical form	Lyophilized powder
Storage	Store lyophilized powder at -20C protected from light and moisture. Reconstituted solutions should be aliquoted and stored frozen; avoid repeated freeze-thaw cycles.